diff --git a/lib/checkbool.cpp b/lib/checkbool.cpp
index 7bcce7ae3..851206fb4 100644
--- a/lib/checkbool.cpp
+++ b/lib/checkbool.cpp
@@ -459,6 +459,7 @@ void CheckBool::pointerArithBoolCond(const Token *tok)
         return;
 
     if (tok->astOperand1() &&
+        tok->astOperand2() &&
         tok->astOperand1()->isName() &&
         tok->astOperand1()->variable() &&
         tok->astOperand1()->variable()->isPointer() &&
diff --git a/test/testgarbage.cpp b/test/testgarbage.cpp
index f884c36e4..8ef22d0d5 100644
--- a/test/testgarbage.cpp
+++ b/test/testgarbage.cpp
@@ -185,6 +185,7 @@ private:
         TEST_CASE(garbageCode133);
         TEST_CASE(garbageCode134);
         TEST_CASE(garbageCode135); // #4994
+        TEST_CASE(garbageCode136); // #7033
 
         TEST_CASE(garbageValueFlow);
         TEST_CASE(garbageSymbolDatabase);
@@ -1073,6 +1074,10 @@ private:
                   "long b = 2 ;");
     }
 
+    void garbageCode136() { // #7033
+        checkCode("{ } () { void f() { node_t * n; for (; -n) {} } } { }");
+    }
+
 
     void garbageValueFlow() {
         // #6089