1 files changed, 4 insertions, 0 deletions
diff --git a/src/ir/effects.h b/src/ir/effects.h
index 8e33f65bf..dbd1bb48f 100644
--- a/src/ir/effects.h
+++ b/src/ir/effects.h
@@ -742,6 +742,10 @@ private:
       // traps when ref is null or we write out of bounds.
       parent.implicitTrap = true;
     }
+    void visitStringConcat(StringConcat* curr) {
+      // traps when an input is null.
+      parent.implicitTrap = true;
+    }
   };
 
 public: