diff --git a/platform/platform-api/src/com/intellij/ui/navigation/History.java b/platform/platform-api/src/com/intellij/ui/navigation/History.java
index df3137dee735..b59d99ba6b53 100644
--- a/platform/platform-api/src/com/intellij/ui/navigation/History.java
+++ b/platform/platform-api/src/com/intellij/ui/navigation/History.java
@@ -73,7 +73,7 @@ public final class History {
   @RequiresEdt
   public void back() {
     int next = findValid(-1);
-    assert next != -1;
+    if (next == -1) return;
     goThere(next);
   }
 
@@ -124,7 +124,7 @@ public final class History {
   @RequiresEdt
   public void forward() {
     int next = findValid(1);
-    assert next != -1;
+    if (next == -1) return;
     goThere(next);
   }