diff --git a/src/ert/config/parsing/config_schema_item.py b/src/ert/config/parsing/config_schema_item.py
index 8c6c44ce698..e8a893cb941 100644
--- a/src/ert/config/parsing/config_schema_item.py
+++ b/src/ert/config/parsing/config_schema_item.py
@@ -222,27 +222,26 @@ def apply_constraints(
         if self.argc_max == 1 and self.argc_min == 1:
             return args_with_context[0]
 
-        if args:
-            if keyword == "QUEUE_OPTION" and args[-1] == "$ERT_LSF_SERVER":
-                raise ConfigValidationError.with_context(
+        if keyword == "QUEUE_OPTION" and value_with_context == "$ERT_LSF_SERVER":
+            raise ConfigValidationError.with_context(
+                (
+                    "Enviroment variable $ERT_LSF_SERVER does not exist. The"
+                    " LSF_SERVER options is usually "
+                    " specified in the site config file."
+                ),
+                value_with_context,
+            )
+        if value_with_context.startswith("$"):
+            warnings.warn(
+                ConfigWarning.with_context(
                     (
-                        "Enviroment variable $ERT_LSF_SERVER does not exist. The"
-                        " LSF_SERVER options is usually "
-                        " specified in the site config file."
+                        f"Environment variable {value_with_context} may not be"
+                        " defined."
                     ),
                     value_with_context,
-                )
-            if args[-1].startswith("$"):
-                warnings.warn(
-                    ConfigWarning.with_context(
-                        (
-                            f"Environment variable {value_with_context} may not be"
-                            " defined."
-                        ),
-                        value_with_context,
-                    ),
-                    stacklevel=1,
-                )
+                ),
+                stacklevel=1,
+            )
 
         return args_with_context