diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4b2981a9..2fabe71d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Fixed
 
+- Fix SQL warning when no user session is active during plugin init
 - Fix text area fields alignment
 - Fix error when submitting a form with an hidden question of type `Field`
 - Fixed a bug where a field was deleted when at least one question in a form was linked to another field
diff --git a/inc/questiontype.class.php b/inc/questiontype.class.php
index 1a8e0b6b..e40963d0 100644
--- a/inc/questiontype.class.php
+++ b/inc/questiontype.class.php
@@ -380,7 +380,15 @@ private function getAvailableBlocks(): array
         $field_container  = new PluginFieldsContainer();
         $available_blocks = [];
 
+        // No session and not CLI: return early to avoid invalid SQL criterion from
+        // getEntitiesRestrictCriteria() (returns entities_id = '' on integer column,
+        // producing MySQL warning 1292). Consistent with the guard in setup.php.
+        if (!Session::getLoginUserID() && !isCommandLine()) {
+            return $available_blocks;
+        }
+
         $entity_restrict = isCommandLine() ? [] : getEntitiesRestrictCriteria(PluginFieldsContainer::getTable(), '', '', true);
+
         $result           = $field_container->find([
             'is_active' => 1,
             'type'      => 'dom',