diff --git a/src/main/java/eu/crushedpixel/replaymod/gui/GuiKeyframeRepository.java b/src/main/java/eu/crushedpixel/replaymod/gui/GuiKeyframeRepository.java
index a5109335..7f3a4014 100644
--- a/src/main/java/eu/crushedpixel/replaymod/gui/GuiKeyframeRepository.java
+++ b/src/main/java/eu/crushedpixel/replaymod/gui/GuiKeyframeRepository.java
@@ -7,6 +7,7 @@ import eu.crushedpixel.replaymod.gui.overlay.GuiReplayOverlay;
 import eu.crushedpixel.replaymod.holders.Keyframe;
 import eu.crushedpixel.replaymod.holders.KeyframeSet;
 import eu.crushedpixel.replaymod.replay.ReplayHandler;
+import eu.crushedpixel.replaymod.utils.CameraPathValidator;
 import net.minecraft.client.Minecraft;
 import net.minecraft.client.gui.GuiButton;
 import net.minecraft.client.gui.GuiScreen;
@@ -135,10 +136,15 @@ public class GuiKeyframeRepository extends GuiScreen implements GuiReplayOverlay
 
                 Keyframe[] keyframes = kfs.toArray(new Keyframe[ReplayHandler.getAllKeyframes().size()]);
                 KeyframeSet newSet = new KeyframeSet(I18n.format("replaymod.gui.keyframerepository.preset.defaultname"), keyframes);
-                if(newSet.getPositionKeyframeCount() < 2 || newSet.getTimeKeyframeCount() < 1) {
-                    message = I18n.format("replaymod.chat.morekeyframes");
+
+                try {
+                    CameraPathValidator.validateCameraPath(ReplayHandler.getPositionKeyframes(), ReplayHandler.getTimeKeyframes());
+                } catch(CameraPathValidator.InvalidCameraPathException e) {
+                    message = e.getLocalizedMessage();
                     break;
-                } else if(keyframeSetList.getCopyOfElements().contains(newSet)) {
+                }
+
+                if(keyframeSetList.getCopyOfElements().contains(newSet)) {
                     message = I18n.format("replaymod.gui.keyframerepository.duplicate");
                     break;
                 }
diff --git a/src/main/java/eu/crushedpixel/replaymod/gui/overlay/GuiReplayOverlay.java b/src/main/java/eu/crushedpixel/replaymod/gui/overlay/GuiReplayOverlay.java
index bad34d61..e9d5149d 100755
--- a/src/main/java/eu/crushedpixel/replaymod/gui/overlay/GuiReplayOverlay.java
+++ b/src/main/java/eu/crushedpixel/replaymod/gui/overlay/GuiReplayOverlay.java
@@ -1,7 +1,6 @@
 package eu.crushedpixel.replaymod.gui.overlay;
 
 import eu.crushedpixel.replaymod.ReplayMod;
-import eu.crushedpixel.replaymod.chat.ChatMessageHandler;
 import eu.crushedpixel.replaymod.entities.CameraEntity;
 import eu.crushedpixel.replaymod.gui.GuiMouseInput;
 import eu.crushedpixel.replaymod.gui.GuiRenderSettings;
@@ -9,11 +8,12 @@ import eu.crushedpixel.replaymod.gui.GuiReplaySpeedSlider;
 import eu.crushedpixel.replaymod.gui.elements.*;
 import eu.crushedpixel.replaymod.gui.elements.timelines.GuiKeyframeTimeline;
 import eu.crushedpixel.replaymod.gui.elements.timelines.GuiMarkerTimeline;
-import eu.crushedpixel.replaymod.holders.Keyframe;
 import eu.crushedpixel.replaymod.holders.AdvancedPosition;
+import eu.crushedpixel.replaymod.holders.Keyframe;
 import eu.crushedpixel.replaymod.holders.TimestampValue;
 import eu.crushedpixel.replaymod.registry.ReplayGuiRegistry;
 import eu.crushedpixel.replaymod.replay.ReplayHandler;
+import eu.crushedpixel.replaymod.utils.CameraPathValidator;
 import eu.crushedpixel.replaymod.utils.MouseUtils;
 import net.minecraft.client.Minecraft;
 import net.minecraft.client.entity.EntityOtherPlayerMP;
@@ -98,12 +98,14 @@ public class GuiReplayOverlay extends Gui {
     private final GuiElement buttonExport = texturedButton(BUTTON_EXPORT_X, BOTTOM_ROW, 40, 0, 20, new Runnable() {
         @Override
         public void run() {
-            //if not enough keyframes, abort and leave chat message
-            if(ReplayHandler.getPositionKeyframes().size() < 2 || ReplayHandler.getTimeKeyframes().size() < 1) {
-                ReplayMod.chatMessageHandler.addLocalizedChatMessage("replaymod.chat.morekeyframes", ChatMessageHandler.ChatMessageType.WARNING);
-            } else {
-                mc.displayGuiScreen(new GuiRenderSettings());
+            try {
+                CameraPathValidator.validateCameraPath(ReplayHandler.getPositionKeyframes(), ReplayHandler.getTimeKeyframes());
+            } catch(CameraPathValidator.InvalidCameraPathException e) {
+                e.printToChat();
+                return;
             }
+            mc.displayGuiScreen(new GuiRenderSettings());
+
         }
     }, "replaymod.gui.ingame.menu.renderpath");
 
diff --git a/src/main/java/eu/crushedpixel/replaymod/replay/ReplayProcess.java b/src/main/java/eu/crushedpixel/replaymod/replay/ReplayProcess.java
index 636ec22f..4ab18c57 100755
--- a/src/main/java/eu/crushedpixel/replaymod/replay/ReplayProcess.java
+++ b/src/main/java/eu/crushedpixel/replaymod/replay/ReplayProcess.java
@@ -10,6 +10,7 @@ import eu.crushedpixel.replaymod.interpolation.GenericSplineInterpolation;
 import eu.crushedpixel.replaymod.settings.RenderOptions;
 import eu.crushedpixel.replaymod.timer.EnchantmentTimer;
 import eu.crushedpixel.replaymod.timer.ReplayTimer;
+import eu.crushedpixel.replaymod.utils.CameraPathValidator;
 import eu.crushedpixel.replaymod.video.VideoRenderer;
 import lombok.Getter;
 import net.minecraft.client.Minecraft;
@@ -78,9 +79,10 @@ public class ReplayProcess {
 
         ReplayMod.chatMessageHandler.initialize();
 
-        //if not enough keyframes, abort and leave chat message
-        if(ReplayHandler.getPositionKeyframes().size() < 2 || ReplayHandler.getTimeKeyframes().size() < 1) {
-            ReplayMod.chatMessageHandler.addLocalizedChatMessage("replaymod.chat.morekeyframes", ChatMessageType.WARNING);
+        try {
+            CameraPathValidator.validateCameraPath(ReplayHandler.getPositionKeyframes(), ReplayHandler.getTimeKeyframes());
+        } catch(CameraPathValidator.InvalidCameraPathException e) {
+            e.printToChat();
             return;
         }
 
diff --git a/src/main/java/eu/crushedpixel/replaymod/utils/CameraPathValidator.java b/src/main/java/eu/crushedpixel/replaymod/utils/CameraPathValidator.java
new file mode 100644
index 00000000..a2c22a84
--- /dev/null
+++ b/src/main/java/eu/crushedpixel/replaymod/utils/CameraPathValidator.java
@@ -0,0 +1,41 @@
+package eu.crushedpixel.replaymod.utils;
+
+import eu.crushedpixel.replaymod.ReplayMod;
+import eu.crushedpixel.replaymod.chat.ChatMessageHandler;
+import eu.crushedpixel.replaymod.holders.AdvancedPosition;
+import eu.crushedpixel.replaymod.holders.Keyframe;
+import eu.crushedpixel.replaymod.holders.TimestampValue;
+import eu.crushedpixel.replaymod.interpolation.KeyframeList;
+import net.minecraft.client.resources.I18n;
+
+public class CameraPathValidator {
+
+    public static class InvalidCameraPathException extends Exception {
+        public InvalidCameraPathException(String message) {
+            super(message);
+        }
+
+        @Override
+        public String getLocalizedMessage() {
+            return I18n.format(getMessage());
+        }
+
+        public void printToChat() {
+            ReplayMod.chatMessageHandler.addLocalizedChatMessage(getMessage(), ChatMessageHandler.ChatMessageType.WARNING);
+        }
+    }
+
+    public static void validateCameraPath(KeyframeList<AdvancedPosition> positionKeyframes, KeyframeList<TimestampValue> timeKeyframes)
+            throws InvalidCameraPathException {
+
+        if(positionKeyframes.size() < 2 || timeKeyframes.size() < 2) {
+            throw new InvalidCameraPathException("replaymod.chat.morekeyframes");
+        }
+
+        int previousTimestamp = -1;
+        for(Keyframe<TimestampValue> timeKeyframe : timeKeyframes) {
+            if(timeKeyframe.getValue().asInt() < previousTimestamp) throw new InvalidCameraPathException("replaymod.chat.negativetime");
+            previousTimestamp = timeKeyframe.getValue().asInt();
+        }
+    }
+}
diff --git a/src/main/resources/assets/replaymod/lang/en_US.lang b/src/main/resources/assets/replaymod/lang/en_US.lang
index 83dd77a6..337ecaea 100644
--- a/src/main/resources/assets/replaymod/lang/en_US.lang
+++ b/src/main/resources/assets/replaymod/lang/en_US.lang
@@ -42,6 +42,7 @@ replaymod.chat.addedmarker=Event Marker has been added
 
 #Chat messages displayed in Replay Viewer
 replaymod.chat.morekeyframes=At least 2 position keyframes and 1 time keyframe required
+replaymod.chat.negativetime=Camera Paths can't play time backwards. Please consult your nearest time lord for assistance.
 replaymod.chat.pathstarted=Camera Path started
 replaymod.chat.pathfinished=Camera Path finished
 replaymod.chat.pathinterrupted=Camera Path canceled