diff --git a/src/caosadvancedtools/json_schema_exporter.py b/src/caosadvancedtools/json_schema_exporter.py
index 5daa5a4ec0543a4ff00c7512e22598b6fe0d50ae..7a92eaad8aeb55ae5c34e529de4848ce4a12b0f9 100644
--- a/src/caosadvancedtools/json_schema_exporter.py
+++ b/src/caosadvancedtools/json_schema_exporter.py
@@ -58,8 +58,9 @@ from collections import OrderedDict
 from typing import Any, Dict, Iterable, List, Optional, Sequence, Tuple, Union
 
 import linkahead as db
-from linkahead.cached import cached_query, cache_clear
+from linkahead.cached import cache_clear, cached_query
 from linkahead.common.datatype import get_list_datatype, is_list_datatype
+
 from .models.data_model import DataModel
 
 
@@ -322,6 +323,10 @@ ui_schema : dict
                             rt = results[0]
                         else:
                             rt = db.Entity()
+
+                    if isinstance(rt, str):
+                        raise NotImplementedError("Behavior is not implemented when _no_remote == True and datatype is given as a string.")
+
                     subschema, ui_schema = self._make_segment_from_recordtype(rt)
                     if prop.is_reference():
                         if prop.name:
@@ -431,6 +436,7 @@ ui_schema : dict
                 }
             }
         """
+
         schema: OrderedDict[str, Any] = OrderedDict({
             "type": "object"
         })
diff --git a/unittests/test_json_schema_exporter.py b/unittests/test_json_schema_exporter.py
index fd6dbf7cd115068c2c172b33a25a24f33a6d373c..3b37f638fc0115fd47757e3bb0afb52c84b66b3e 100644
--- a/unittests/test_json_schema_exporter.py
+++ b/unittests/test_json_schema_exporter.py
@@ -23,18 +23,16 @@
 """Tests the Json schema exporter."""
 
 import json
-
-import linkahead as db
-import caosadvancedtools.json_schema_exporter as jsex
-
 from collections import OrderedDict
-
-from jsonschema import FormatChecker, validate, ValidationError
-from pytest import raises
 from unittest.mock import Mock, patch
 
-from caosadvancedtools.json_schema_exporter import recordtype_to_json_schema as rtjs
+import caosadvancedtools.json_schema_exporter as jsex
+import linkahead as db
+from caosadvancedtools.json_schema_exporter import \
+    recordtype_to_json_schema as rtjs
 from caosadvancedtools.models.parser import parse_model_from_string
+from jsonschema import FormatChecker, ValidationError, validate
+from pytest import raises
 
 GLOBAL_MODEL = parse_model_from_string("""
 RT1:
@@ -920,10 +918,12 @@ RT3:
     schema_noexist = rtjs(model.get_deep("RT3"))
     assert schema_noexist["properties"]["NoRecords"].get("type") == "object"
 
-    schema_noexist_noremote = rtjs(model.get_deep("RT3"), no_remote=True)
-    assert schema_noexist_noremote["properties"]["NoRecords"].get("type") == "object"
-    assert (schema_noexist_noremote["properties"]["NoRecords"].get("properties")
-            == OrderedDict([('some_text', {'type': 'string'})]))
+    with raises(NotImplementedError,
+                match="Behavior is not implemented when _no_remote == True and datatype is given as a string."):
+        schema_noexist_noremote = rtjs(model.get_deep("RT3"), no_remote=True)
+        assert schema_noexist_noremote["properties"]["NoRecords"].get("type") == "object"
+        assert (schema_noexist_noremote["properties"]["NoRecords"].get("properties")
+                == OrderedDict([('some_text', {'type': 'string'})]))
 
     uischema = {}
     schema_noexist_noretrieve = rtjs(model.get_deep("RT2"), do_not_retrieve=["RT1"],