diff --git a/platform/platform-impl/src/com/intellij/openapi/editor/ex/util/EditorUtil.java b/platform/platform-impl/src/com/intellij/openapi/editor/ex/util/EditorUtil.java
index caa6447c085f..7e7378af51f4 100644
--- a/platform/platform-impl/src/com/intellij/openapi/editor/ex/util/EditorUtil.java
+++ b/platform/platform-impl/src/com/intellij/openapi/editor/ex/util/EditorUtil.java
@@ -407,6 +407,9 @@ public class EditorUtil {
   }
 
   public static int nextTabStop(int x, Editor editor, int tabSize) {
+    if (tabSize <= 0) {
+      return x + getSpaceWidth(Font.PLAIN, editor);
+    }
     tabSize *= getSpaceWidth(Font.PLAIN, editor);
 
     int nTabs = x / tabSize;