diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7bd05ba..a391067 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,18 @@ CalVer image tags (`stable-YYYY.MM.N`, `dev-YYYY.MM.N`) are produced for every C
 
 ## [Unreleased]
 
+## [0.54.27] — 2026-05-18
+
+### Fixed
+- `/admin/tables` edit modal no longer throws `ReferenceError` on
+  non-Keboola instances (BigQuery, CSV). Two JS helpers
+  (`_getEditKbSyncMode`, `onEditKbSyncModeChange`) were wrapped in
+  the `{% if data_source_type == 'keboola' %}` template guard but
+  called unconditionally from sync-mode radio buttons rendered for
+  all instance types. The guard now scopes only the discover /
+  prefill helpers that actually talk to the Keboola Storage API;
+  the shared sync-mode helpers ship to every instance.
+
 ## [0.54.26] — 2026-05-18
 
 ### Changed
diff --git a/app/web/templates/admin_tables.html b/app/web/templates/admin_tables.html
index 0ae567f..c7eed96 100644
--- a/app/web/templates/admin_tables.html
+++ b/app/web/templates/admin_tables.html
@@ -2234,8 +2234,10 @@
                 showToast('' + err.message, 'error');
             });
     }
+    {% endif %}{# data_source_type == 'keboola' — discover helpers #}
 
-    // ── Keboola tab edit modal (Phase F2) ──────────────────────────
+    // ── Keboola edit-modal sync-mode helpers (always needed — radio buttons
+    //    are rendered for all instance types) ───────────────────────────────
 
     function _getEditKbSyncMode() {
         var el = document.querySelector('input[name="editKbSyncMode"]:checked');
@@ -2256,6 +2258,7 @@
         if (mode === 'direct') onEditKbStrategyChange();
     }
 
+    {% if data_source_type == 'keboola' %}{# Phase F2 edit modal + prefill — keboola-only #}
     function _getEditKbStrategy() {
         var el = document.getElementById('editKbStrategy');
         return el ? el.value : 'full_refresh';
@@ -2483,7 +2486,7 @@
         }
         ta.value = 'SELECT *\nFROM kbc."' + bucket + '"."' + sourceTable + '"\nWHERE -- your filter here';
     }
-    {% endif %}{# data_source_type == 'keboola' — discover/prefill JS #}
+    {% endif %}{# data_source_type == 'keboola' — Phase F2 edit modal + prefill #}
 
     // C3: removed dead helper _buildKeboolaLegacyPayload — the Phase F
     // _buildKeboolaPayload (above) replaced it.
diff --git a/pyproject.toml b/pyproject.toml
index a1a6ccc..d7a0fee 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "agnes-the-ai-analyst"
-version = "0.54.26"
+version = "0.54.27"
 description = "Agnes — AI Data Analyst platform for AI analytical systems"
 requires-python = ">=3.11,<3.14"
 license = "MIT"