diff --git a/lib/Validators/BaseValidator.php b/lib/Validators/BaseValidator.php
index 6ae05d4a9..7fa7d9191 100644
--- a/lib/Validators/BaseValidator.php
+++ b/lib/Validators/BaseValidator.php
@@ -109,6 +109,9 @@ private function not_empty($value): bool {
 			return true;
 		}
 
+		if (is_string($value)) {
+			return strlen(trim($value)) > 0;
+		}
 		return !empty($value);
 	}