diff --git a/snapi-frontend/src/main/scala/raw/compiler/rql2/antlr4/RawSnapiVisitor.scala b/snapi-frontend/src/main/scala/raw/compiler/rql2/antlr4/RawSnapiVisitor.scala
index 6d74d601b..aed57a402 100644
--- a/snapi-frontend/src/main/scala/raw/compiler/rql2/antlr4/RawSnapiVisitor.scala
+++ b/snapi-frontend/src/main/scala/raw/compiler/rql2/antlr4/RawSnapiVisitor.scala
@@ -319,7 +319,7 @@ class RawSnapiVisitor(
         .getOrElse((IdnDef(""), Option.empty))
 
       val exp =
-        Option(context.expr()).map(exprContext => Option(visit(exprContext)).getOrElse(ErrorExp).asInstanceOf[Exp])
+        Option(context.expr()).map(exprContext => Option(visit(exprContext)).getOrElse(ErrorExp()).asInstanceOf[Exp])
 
       val result = FunParam(
         tupple._1,
@@ -347,7 +347,7 @@ class RawSnapiVisitor(
     .flatMap { context =>
       Option(context.expr()).map { exprContext =>
         val result: FunAppArg =
-          FunAppArg(Option(visit(exprContext)).getOrElse(ErrorExp).asInstanceOf[Exp], Option.empty)
+          FunAppArg(Option(visit(exprContext)).getOrElse(ErrorExp()).asInstanceOf[Exp], Option.empty)
         positionsWrapper.setPosition(context, result)
         result
       }
diff --git a/snapi-frontend/src/test/scala/raw/compiler/rql2/Antlr4LSPTests.scala b/snapi-frontend/src/test/scala/raw/compiler/rql2/Antlr4LSPTests.scala
index 47471badd..0765dcc28 100644
--- a/snapi-frontend/src/test/scala/raw/compiler/rql2/Antlr4LSPTests.scala
+++ b/snapi-frontend/src/test/scala/raw/compiler/rql2/Antlr4LSPTests.scala
@@ -228,4 +228,12 @@ class Antlr4LSPTests extends RawTestSuite {
     )
   }
 
+  test("RD11199") { _ =>
+    val prog = "Collection.Transform(Int.Range(1, 100000), -="
+    val result = parseWithAntlr4(prog)
+    assert(
+      result.errors(0).message == "the input does not form a valid statement or expression."
+    )
+  }
+
 }