diff --git a/calendar/inc/class.calendar_uiforms.inc.php b/calendar/inc/class.calendar_uiforms.inc.php
index f7297a382b..5ee36a63a9 100644
--- a/calendar/inc/class.calendar_uiforms.inc.php
+++ b/calendar/inc/class.calendar_uiforms.inc.php
@@ -303,7 +303,7 @@ class calendar_uiforms extends calendar_ui
 		// (add, edit, update, delete)
 		$update_type = $content['id'] ? ($content['recur_type'] == MCAL_RECUR_NONE ? 'update' : 'edit') : 'add';
 
-		$button = @key($content['button']);
+		$button = @key((array)$content['button']);
 		if (!$button && $content['action']) $button = $content['action'];	// action selectbox
 		unset($content['button']); unset($content['action']);
 
diff --git a/infolog/inc/class.infolog_ui.inc.php b/infolog/inc/class.infolog_ui.inc.php
index 3bc4ee7c89..1e4b17740f 100644
--- a/infolog/inc/class.infolog_ui.inc.php
+++ b/infolog/inc/class.infolog_ui.inc.php
@@ -1781,7 +1781,7 @@ class infolog_ui
 			$referer   = $content['referer'];   unset($content['referer']);
 			$no_popup  = $content['no_popup'];  unset($content['no_popup']);
 
-			$button = @key($content['button']);
+			$button = @key((array)$content['button']);
 			if (!$button && $action) $button = $action;	// action selectbox
 			//info_cc expects an comma separated string
 			//error_log(__METHOD__.__LINE__.array2string($content));