diff --git a/src/ASTPrinter.cpp b/src/ASTPrinter.cpp
index f5adbcc..60d78af 100644
--- a/src/ASTPrinter.cpp
+++ b/src/ASTPrinter.cpp
@@ -227,7 +227,10 @@ std::any ASTPrinter::visitUnaryExp(SysYParser::UnaryExpContext *ctx){
     cout << ctx->Ident()->getText() << ctx->LPAREN()->getText();
     if(ctx->funcRParams())
       ctx->funcRParams()->accept(this);
-    cout << ctx->RPAREN()->getText();
+    if (ctx->RPAREN())
+      cout << ctx->RPAREN()->getText();
+    else
+      cout << "<missing \')\'?>";
   }
   else if(ctx->unaryExp()){
     cout << ctx->unaryOp()->getText();
diff --git a/test/bug1.sy b/test/bug1.sy
new file mode 100644
index 0000000..c7dcb0c
--- /dev/null
+++ b/test/bug1.sy
@@ -0,0 +1,7 @@
+// bug1: getint(;
+
+int main() {
+  int a;
+  a = getint(;
+  return 0;
+}
\ No newline at end of file