diff --git a/src/Spout/Writer/ODS/Manager/WorksheetManager.php b/src/Spout/Writer/ODS/Manager/WorksheetManager.php
index cf47f5a..3b8da63 100644
--- a/src/Spout/Writer/ODS/Manager/WorksheetManager.php
+++ b/src/Spout/Writer/ODS/Manager/WorksheetManager.php
@@ -245,7 +245,12 @@ class WorksheetManager implements WorksheetManagerInterface
         } else {
             $value = $cell->getValueEvenIfError();
 
-            throw new InvalidArgumentException('Trying to add a value with an unsupported type: ' . (\is_object($value) ? \get_class($value) : \gettype($value)));
+            $errorMessage = 'Trying to add a value with an unsupported type: ' . \gettype($value);
+            if (\is_object($value)) {
+                $errorMessage .= ' (' . \get_class($value) . ' given)';
+            }
+
+            throw new InvalidArgumentException($errorMessage);
         }
 
         return $data;