diff --git a/src/qmlcompiler/qqmljscodegenerator.cpp b/src/qmlcompiler/qqmljscodegenerator.cpp
index 687bdbdb8f..e6723a25b6 100644
--- a/src/qmlcompiler/qqmljscodegenerator.cpp
+++ b/src/qmlcompiler/qqmljscodegenerator.cpp
@@ -448,6 +448,7 @@ void QQmlJSCodeGenerator::generate_MoveConst(int constIndex, int destTemp)
         input = toNumericString(v4Value.doubleValue());
     } else {
         reject(u"unknown const type"_s);
+        return;
     }
     m_body += conversion(contained, changed, input) + u";\n"_s;
     generateOutputVariantConversion(contained);
diff --git a/tests/auto/qml/qmlcppcodegen/data/failures.qml b/tests/auto/qml/qmlcppcodegen/data/failures.qml
index 35dd1f0255..22c0c8390a 100644
--- a/tests/auto/qml/qmlcppcodegen/data/failures.qml
+++ b/tests/auto/qml/qmlcppcodegen/data/failures.qml
@@ -81,4 +81,6 @@ QtObject {
 
     readonly property int someNumber: 10
     function writeToReadonly() { someNumber = 20 }
+
+    property var silly: [,0]
 }