diff --git a/core/log.class.inc.php b/core/log.class.inc.php
index a3d00390c..df92d2ae0 100644
--- a/core/log.class.inc.php
+++ b/core/log.class.inc.php
@@ -854,10 +854,32 @@ class DeprecatedCallsLog extends LogAPI
 	/** @var \FileLog we want our own instance ! */
 	protected static $m_oFileLog = null;
 
+	/**
+	 * Indirection to {@see \LogAPI::IsLogLevelEnabled()} that is handling possible {@see ConfigException}
+	 *
+	 * @param string $sLevel
+	 * @param string $sChannel
+	 *
+	 * @return bool if exception occurs, then returns false
+	 *
+	 * @uses \LogAPI::IsLogLevelEnabled()
+	 */
+	protected static function IsLogLevelEnabledSafe($sLevel, $sChannel): bool
+	{
+		try {
+			$bIsLogLevelEnabled = static::IsLogLevelEnabled(self::LEVEL_WARNING, self::ENUM_CHANNEL_PHP_LIBMETHOD);
+		}
+		catch (ConfigException $e) {
+			$bIsLogLevelEnabled = false;
+		}
+
+		return $bIsLogLevelEnabled;
+	}
+
 	/**
 	 * @param string|null $sTargetFile
 	 *
-	 *@uses \set_error_handler() to catch deprecated notices
+	 * @uses \set_error_handler() to catch deprecated notices
 	 *
 	 * @since 3.0.0 N°3002 logs deprecated notices in called code
 	 */
@@ -868,13 +890,7 @@ class DeprecatedCallsLog extends LogAPI
 		}
 		parent::Enable($sTargetFile);
 
-		try {
-			$bIsLogLevelEnabled = static::IsLogLevelEnabled(self::LEVEL_WARNING, self::ENUM_CHANNEL_PHP_LIBMETHOD);
-		}
-		catch (ConfigException $e) {
-			$bIsLogLevelEnabled = false;
-		}
-		if ($bIsLogLevelEnabled) {
+		if (static::IsLogLevelEnabledSafe(self::LEVEL_WARNING, self::ENUM_CHANNEL_PHP_LIBMETHOD)) {
 			set_error_handler([static::class, 'DeprecatedNoticesErrorHandler']);
 		}
 	}
@@ -901,6 +917,11 @@ class DeprecatedCallsLog extends LogAPI
 			return false;
 		}
 
+		if (false === static::IsLogLevelEnabledSafe(self::LEVEL_WARNING, self::ENUM_CHANNEL_PHP_LIBMETHOD)) {
+			// returns true so that nothing is throwned !
+			return true;
+		}
+
 		$aStack = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 4);
 		$iStackDeprecatedMethodLevel = 2; // level 0 = current method, level 1 = @trigger_error, level 2 = method containing the `trigger_error` call
 		$sDeprecatedObject = $aStack[$iStackDeprecatedMethodLevel]['class'];
diff --git a/test/core/Log/ExceptionLogTest.php b/test/core/Log/ExceptionLogTest.php
index b481f4b16..dc1c5e242 100644
--- a/test/core/Log/ExceptionLogTest.php
+++ b/test/core/Log/ExceptionLogTest.php
@@ -16,19 +16,34 @@
 namespace Combodo\iTop\Test\UnitTest\Core\Log;
 
 use Combodo\iTop\Test\UnitTest\ItopDataTestCase;
+use DeprecatedCallsLog;
 use ExceptionLog;
+use LogAPI;
+use MetaModel;
 
 
-require_once (__DIR__.'/ExceptionLogTest/Exceptions.php');
+require_once(__DIR__.'/ExceptionLogTest/Exceptions.php');
+
 class ExceptionLogTest extends ItopDataTestCase
 {
 	protected function setUp()
 	{
-		require_once (__DIR__.'/ExceptionLogTest/Exceptions.php');
+		require_once(__DIR__.'/ExceptionLogTest/Exceptions.php');
 		parent::setUp();
 
-		$oConfig = \MetaModel::GetConfig();
-		$oConfig->Set('developer_mode.enabled', false);
+		// We are using PHPUnit\Framework\MockObject\Generator::generateMock that is throwing notice !
+		// Changing the log config so that those won't be caught by \DeprecatedCallsLog::DeprecatedNoticesErrorHandler
+		$oConfig = MetaModel::GetConfig();
+		$mLogLevelMin = $oConfig->Get('log_level_min');
+		if (is_string($mLogLevelMin)) {
+			$aLogLevelMin[''] = $mLogLevelMin;
+		} else if (is_array($mLogLevelMin)) {
+			$aLogLevelMin = $mLogLevelMin;
+		} else {
+			$aLogLevelMin = [];
+		}
+		$aLogLevelMin[DeprecatedCallsLog::ENUM_CHANNEL_PHP_LIBMETHOD] = LogAPI::LEVEL_ERROR;
+		$oConfig->Set('log_level_min', $aLogLevelMin);
 	}
 
 	/**