diff --git a/core/attributedef.class.inc.php b/core/attributedef.class.inc.php
index 3007d9575..e8c3f9ac5 100644
--- a/core/attributedef.class.inc.php
+++ b/core/attributedef.class.inc.php
@@ -6293,7 +6293,9 @@ class AttributeTable extends AttributeDBField
 			$sRes .= "<TR>";
 			foreach ($aRawData as $iCol => $cell)
 			{
-				$sCell = str_replace("\n", "<br>\n", Str::pure2html((string)$cell));
+				// Note: avoid the warning in case the cell is made of an array
+				$sCell = @Str::pure2html((string)$cell);
+				$sCell = str_replace("\n", "<br>\n", $sCell);
 				$sRes .= "<TD>$sCell</TD>";
 			}
 			$sRes .= "</TR>";
diff --git a/core/event.class.inc.php b/core/event.class.inc.php
index 97d7d19c9..52b1bca89 100644
--- a/core/event.class.inc.php
+++ b/core/event.class.inc.php
@@ -264,8 +264,8 @@ class EventIssue extends Event
 				}
 				else
 				{
-					// Not a string
-					$aPost[$sKey] = (string) $sValue;
+					// Not a string (avoid warnings in case the value cannot be easily casted into a string)
+					$aPost[$sKey] = @(string) $sValue;
 				}
 			}
 			$this->Set('arguments_post', $aPost);