diff --git a/libs/ui/KeyCharacterMap.cpp b/libs/ui/KeyCharacterMap.cpp
index 9bfa8f6..2decfe9 100644
--- a/libs/ui/KeyCharacterMap.cpp
+++ b/libs/ui/KeyCharacterMap.cpp
@@ -185,9 +185,11 @@
     const Key* key;
     const Behavior* behavior;
     if (getKeyBehavior(keyCode, metaState, &key, &behavior)) {
-        outFallbackAction->keyCode = behavior->fallbackKeyCode;
-        outFallbackAction->metaState = metaState & ~behavior->metaState;
-        result = true;
+        if (behavior->fallbackKeyCode) {
+            outFallbackAction->keyCode = behavior->fallbackKeyCode;
+            outFallbackAction->metaState = metaState & ~behavior->metaState;
+            result = true;
+        }
     }
 #if DEBUG_MAPPING
     LOGD("getFallbackKeyCode: keyCode=%d, metaState=0x%08x ~ Result %s, "