diff --git a/lib/checkassert.cpp b/lib/checkassert.cpp
index a96191288c29..fb22e192c419 100644
--- a/lib/checkassert.cpp
+++ b/lib/checkassert.cpp
@@ -129,6 +129,9 @@ void CheckAssert::checkVariableAssignment(const Token* assignTok, const Scope *a
     if (!assignTok->isAssignmentOp() && assignTok->tokType() != Token::eIncDecOp)
         return;
 
+    if (!assignTok->astOperand1())
+        return;
+
     const Variable* var = assignTok->astOperand1()->variable();
     if (!var)
         return;
diff --git a/test/cli/fuzz-crash/crash-186a1454bca1f10fbc8767d8cc74152bf326a449 b/test/cli/fuzz-crash/crash-186a1454bca1f10fbc8767d8cc74152bf326a449
new file mode 100644
index 000000000000..3097b665c2bc
--- /dev/null
+++ b/test/cli/fuzz-crash/crash-186a1454bca1f10fbc8767d8cc74152bf326a449
@@ -0,0 +1 @@
+assert({=;})
\ No newline at end of file