diff --git a/gradle.properties b/gradle.properties
index 3fe94fba4..f71c4f6e1 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,5 +1,5 @@
 # Mod properties
-mod_version=1.89.0
+mod_version=1.89.1
 
 # Minecraft properties
 mc_version=1.12.2
diff --git a/src/main/java/dan200/computercraft/client/render/TileEntityMonitorRenderer.java b/src/main/java/dan200/computercraft/client/render/TileEntityMonitorRenderer.java
index 7dd003152..9e4620574 100644
--- a/src/main/java/dan200/computercraft/client/render/TileEntityMonitorRenderer.java
+++ b/src/main/java/dan200/computercraft/client/render/TileEntityMonitorRenderer.java
@@ -170,7 +170,7 @@ private static void renderTerminal( ClientMonitor monitor, float xMargin, float
                     }
 
                     ByteBuffer monitorBuffer = tboContents;
-                    monitorBuffer.position( 0 );
+                    monitorBuffer.clear();
                     for( int y = 0; y < height; y++ )
                     {
                         TextBuffer text = terminal.getLine( y ), textColour = terminal.getTextColourLine( y ), background = terminal.getBackgroundColourLine( y );
diff --git a/src/main/resources/assets/computercraft/lua/rom/help/changelog.txt b/src/main/resources/assets/computercraft/lua/rom/help/changelog.txt
index 7c9eac4ce..97d223b6b 100644
--- a/src/main/resources/assets/computercraft/lua/rom/help/changelog.txt
+++ b/src/main/resources/assets/computercraft/lua/rom/help/changelog.txt
@@ -1,3 +1,7 @@
+# New features in CC: Tweaked 1.89.1
+
+* Fix crashes when rendering monitors of varying sizes.
+
 # New features in CC: Tweaked 1.89.0
 
 * Compress monitor data, reducing network traffic by a significant amount.
diff --git a/src/main/resources/assets/computercraft/lua/rom/help/whatsnew.txt b/src/main/resources/assets/computercraft/lua/rom/help/whatsnew.txt
index d715a80f5..ddb0a9fe9 100644
--- a/src/main/resources/assets/computercraft/lua/rom/help/whatsnew.txt
+++ b/src/main/resources/assets/computercraft/lua/rom/help/whatsnew.txt
@@ -1,10 +1,5 @@
-New features in CC: Tweaked 1.89.0
+New features in CC: Tweaked 1.89.1
 
-* Compress monitor data, reducing network traffic by a significant amount.
-* Allow limiting the bandwidth monitor updates use.
-* Several optimisations to monitor rendering (@Lignum)
-
-And several bug fixes:
-* Fix settings.load failing on defined settings.
+* Fix crashes when rendering monitors of varying sizes.
 
 Type "help changelog" to see the full version history.