diff --git a/internal/proxy/plan_parser.go b/internal/proxy/plan_parser.go
index d1f420e204..443c5c3b4f 100644
--- a/internal/proxy/plan_parser.go
+++ b/internal/proxy/plan_parser.go
@@ -858,7 +858,7 @@ func (pc *parserContext) handleExpr(nodeRaw *ant_ast.Node) (*planpb.Expr, error)
 	case *ant_ast.BinaryNode:
 		return pc.handleBinaryExpr(node)
 	default:
-		return nil, fmt.Errorf("unsupported node (%s)", node.Type().String())
+		return nil, fmt.Errorf("unsupported node")
 	}
 }