fix relation decoration

Author: Marius

src/Decorators/AbstractResourceDecorator.php

@@ -214,12 +214,18 @@ public static function applyHtmlSpecialChars(mixed $value): mixed
      */
     public function isRelationAggregate(string $columnName): bool
     {
+        $suffix = \substr($columnName, -6);
+        $relationName = \substr($columnName, 0, -6);
+
         return (
-            \substr($columnName, -6) === static::COUNT_SUFFIX
-            && \in_array(\substr($columnName, 0, -6), $this->getCountRelations(), true)
-        ) || (
-            \substr($columnName, -6) === static::EXIST_SUFFIX
-            && \in_array(\substr($columnName, 0, -6), $this->getExistRelations(), true)
-        );
+                \in_array($suffix, [static::COUNT_SUFFIX, static::EXIST_SUFFIX], true)
+                && isset($this->getRelationMappings()[$relationName])
+            ) || (
+                $suffix === static::COUNT_SUFFIX
+                && \in_array($relationName, $this->getCountRelations(), true)
+            ) || (
+                $suffix === static::EXIST_SUFFIX
+                && \in_array($relationName, $this->getExistRelations(), true)
+            );
     }
 }