diff --git a/combo/data/models.py b/combo/data/models.py
index e7bc03de..b2457526 100644
--- a/combo/data/models.py
+++ b/combo/data/models.py
@@ -1852,7 +1852,7 @@ class JsonCellBase(CellBase):
                 url = utils.get_templated_url(data_url_dict['url'], context)
             except utils.TemplateError as e:
                 logger = logging.getLogger(__name__)
-                if log_errors:
+                if log_errors and e.msg.startswith('syntax error'):
                     logger.error('error in templated URL (%s): %s', data_url_dict['url'], e)
                 else:
                     logger.debug('error in templated URL (%s): %s', data_url_dict['url'], e)
diff --git a/tests/test_cells.py b/tests/test_cells.py
index 4e165cca..0ac397ab 100644
--- a/tests/test_cells.py
+++ b/tests/test_cells.py
@@ -1,5 +1,6 @@
 import datetime
 import json
+import logging
 import os
 import re
 from unittest import mock
@@ -459,7 +460,8 @@ def mocked_request(*args, **kwargs):
     pass
 
 
-def test_json_cell():
+def test_json_cell(caplog):
+    caplog.set_level(logging.DEBUG)
     page = Page(title='example page', slug='example-page')
     page.save()
 
@@ -577,11 +579,19 @@ def test_json_cell():
         assert requests_get.call_args[0][0] == 'http://testuser?barfoo'
         assert requests_get.call_args[1]['cache_duration'] == 10
         assert requests_get.call_count == 1
+    caplog.clear()
     with mock.patch('combo.utils.requests.get') as requests_get:
         context = cell.get_cell_extra_context({})
         # can't get URL, 'foobar' variable is missing
         assert context['json'] is None
         assert requests_get.call_count == 0
+        assert caplog.record_tuples == [
+            (
+                'combo.data.models',
+                logging.DEBUG,
+                'error in templated URL (http://testuser?[foobar]): unknown variable foobar',
+            )
+        ]
     request = RequestFactory().get('/')
     request.user = User(username='foo', email='foo@example.net')
     cell.url = 'http://testuser?email=[user_email]'
@@ -594,6 +604,38 @@ def test_json_cell():
         assert requests_get.call_args[0][0] == 'http://testuser?email=foo%40example.net'
         assert requests_get.call_args[1]['cache_duration'] == 10
 
+    # URL is a template
+    cell.url = 'http://testuser?{{ concerned_user|name_id }}'
+    caplog.clear()
+    with mock.patch('combo.utils.requests.get') as requests_get:
+        context = cell.get_cell_extra_context({})
+        # can't get URL, variable is missing
+        assert context['json'] is None
+        assert requests_get.call_count == 0
+        assert caplog.record_tuples == [
+            (
+                'combo.data.models',
+                logging.DEBUG,
+                'error in templated URL (http://testuser?{{ concerned_user|name_id }}): name_id',
+            )
+        ]
+
+    cell.url = 'http://testuser?{% for %}'
+    caplog.clear()
+    with mock.patch('combo.utils.requests.get') as requests_get:
+        context = cell.get_cell_extra_context({})
+        # can't get URL, variable is missing
+        assert context['json'] is None
+        assert requests_get.call_count == 0
+        assert len(caplog.records) == 1
+        assert caplog.record_tuples == [
+            (
+                'combo.data.models',
+                logging.ERROR,
+                'error in templated URL (http://testuser?{% for %}): syntax error',
+            )
+        ]
+
 
 def test_json_cell_with_varnames(app):
     page = Page(title='example page', slug='index')