diff --git a/webservices/webservices.basic.php b/webservices/webservices.basic.php
index 3db4302d1..9749773f8 100644
--- a/webservices/webservices.basic.php
+++ b/webservices/webservices.basic.php
@@ -107,6 +107,13 @@ class BasicServices extends WebServicesBase
 		}
 		UserRights::Login($sLogin);
 
+		if (!class_exists('Incident'))
+		{
+			$oRes = new WebServiceResult();
+			$oRes->LogError("The class Incident does not exist. Did you install the Incident Management (ITIL) module ?");
+			return $oRes;
+		}
+		
 		$aCallerDesc = self::SoapStructToExternalKeySearch($oCallerDesc);
 		$aCustomerDesc = self::SoapStructToExternalKeySearch($oCustomerDesc);
 		$aServiceDesc = self::SoapStructToExternalKeySearch($oServiceDesc);
diff --git a/webservices/webservices.class.inc.php b/webservices/webservices.class.inc.php
index ddaa45b1d..cf6e6533e 100644
--- a/webservices/webservices.class.inc.php
+++ b/webservices/webservices.class.inc.php
@@ -284,10 +284,10 @@ abstract class WebServicesBase
 		$oLog->Set('userinfo', UserRights::GetUser());
 		$oLog->Set('verb', $sVerb);
 		$oLog->Set('result', $oRes->IsOk());
-		$this->TrimAndSetValue($oLog, 'log_info', $oRes->GetInfoAsText());
-		$this->TrimAndSetValue($oLog, 'log_warning', $oRes->GetWarningsAsText());
-		$this->TrimAndSetValue($oLog, 'log_error', $oRes->GetErrorsAsText());
-		$this->TrimAndSetValue($oLog, 'data', $oRes->GetReturnedDataAsText());
+		$this->TrimAndSetValue($oLog, 'log_info', (string)$oRes->GetInfoAsText());
+		$this->TrimAndSetValue($oLog, 'log_warning', (string)$oRes->GetWarningsAsText());
+		$this->TrimAndSetValue($oLog, 'log_error', (string)$oRes->GetErrorsAsText());
+		$this->TrimAndSetValue($oLog, 'data', (string)$oRes->GetReturnedDataAsText());
 		$oLog->DBInsertNoReload();
 	}