diff --git a/core/attributedef.class.inc.php b/core/attributedef.class.inc.php
index e8a9f4a09..64bd7bd4b 100644
--- a/core/attributedef.class.inc.php
+++ b/core/attributedef.class.inc.php
@@ -6460,7 +6460,13 @@ class AttributeDateTime extends AttributeDBField
 			try {
 				$oDate = new DateTimeImmutable($sDefaultValue);
 			} catch (Exception $e) {
-				$oDate = new DateTimeImmutable(Expression::FromOQL($sDefaultValue)->Evaluate([]));
+				try {
+					$oDate = new DateTimeImmutable(Expression::FromOQL($sDefaultValue)->Evaluate([]));
+				} catch (Exception $e) {
+					IssueLog::Error("Invalid default value '$sDefaultValue' for field '{$this->GetCode()}' on class '{$this->GetHostClass()}', defaulting to null");
+					return $this->GetNullValue();
+				}
+
 			}
 			return $oDate->format($this->GetInternalFormat());
 		}
diff --git a/tests/php-unit-tests/src/BaseTestCase/ItopDataTestCase.php b/tests/php-unit-tests/src/BaseTestCase/ItopDataTestCase.php
index 0f2c27a3e..9c6f47425 100644
--- a/tests/php-unit-tests/src/BaseTestCase/ItopDataTestCase.php
+++ b/tests/php-unit-tests/src/BaseTestCase/ItopDataTestCase.php
@@ -1492,6 +1492,12 @@ abstract class ItopDataTestCase extends ItopTestCase
 		$this->assertEquals(1, $oSet->Count(), $sMessage);
 	}
 
+	protected function AssertLastErrorLogEntryContains(string $sNeedle, string $sMessage = '')
+	{
+		$aLastLines = self::ReadTail(APPROOT.'/log/error.log');
+		$this->assertStringContainsString($sNeedle, $aLastLines[0], $sMessage);
+	}
+
 	static protected function StartStopwatchInThePast(DBObject $oObject, string $sStopwatchAttCode, int $iDelayInSecond)
 	{
 		$iStartDate = time() - $iDelayInSecond;
diff --git a/tests/php-unit-tests/src/BaseTestCase/ItopTestCase.php b/tests/php-unit-tests/src/BaseTestCase/ItopTestCase.php
index 52cbe3436..fda90fbbb 100644
--- a/tests/php-unit-tests/src/BaseTestCase/ItopTestCase.php
+++ b/tests/php-unit-tests/src/BaseTestCase/ItopTestCase.php
@@ -572,4 +572,35 @@ abstract class ItopTestCase extends TestCase
 		}
 		return parent::bootKernel($options);
 	}
+
+	/**
+	 * @author Ain Tohvri <https://mstdn.social/@tekkie>
+	 */
+	static protected function ReadTail($sFilename, $iLines = 1)
+	{
+		$handle = fopen($sFilename, "r");
+		$iLineCounter = $iLines;
+		$iPos = -2;
+		$bBeginning = false;
+		$aLines = array();
+		while ($iLineCounter > 0) {
+			$sChar = " ";
+			while ($sChar != "\n") {
+				if(fseek($handle, $iPos, SEEK_END) == -1) {
+					$bBeginning = true;
+					break;
+				}
+				$sChar = fgetc($handle);
+				$iPos --;
+			}
+			$iLineCounter --;
+			if ($bBeginning) {
+				rewind($handle);
+			}
+			$aLines[$iLines - $iLineCounter - 1] = fgets($handle);
+			if ($bBeginning) break;
+		}
+		fclose ($handle);
+		return array_reverse($aLines);
+	}
 }
diff --git a/tests/php-unit-tests/unitary-tests/core/AttributeDefinitionTest.php b/tests/php-unit-tests/unitary-tests/core/AttributeDefinitionTest.php
index 5b25b455b..82d5c4a17 100644
--- a/tests/php-unit-tests/unitary-tests/core/AttributeDefinitionTest.php
+++ b/tests/php-unit-tests/unitary-tests/core/AttributeDefinitionTest.php
@@ -254,6 +254,20 @@ PHP
 		self::assertNull($defaultValue, 'Empty default value for DateTime attribute should give null default value');
 	}
 
+	public function testDateTimeInvalidDefaultReturnsNullAsDefaultValue()
+	{
+		// Given
+		$oDateAttribute = new AttributeDateTime('start_date', ['sql' => 'start_date', 'is_null_allowed' => false, 'default_value' => 'zabugomeuh', 'allowed_values' => null, 'depends_on' => [], 'always_load_in_tables' => false]);
+		$oDateAttribute->SetHostClass('WorkOrder');
+
+		//When
+		$defaultValue = $oDateAttribute->GetDefaultValue();
+
+		// Then
+		self::assertNull($defaultValue, 'Invalid default value for DateTime attribute should give null default value');
+		self::AssertLastErrorLogEntryContains("Invalid default value 'zabugomeuh' for field 'start_date' on class 'WorkOrder', defaulting to null", "Last error log entry should contain a meaningful message");
+	}
+
 	public function testDateEmptyDefaultReturnsNullAsDefaultValue()
 	{
 		// Given
@@ -267,6 +281,20 @@ PHP
 		self::assertNull($defaultValue, 'Empty default value for Date attribute should give null default value');
 	}
 
+	public function testDateInvalidDefaultReturnsNullAsDefaultValue()
+	{
+		// Given
+		$oDateAttribute = new AttributeDate('start_date', ['sql' => 'start_date', 'is_null_allowed' => false, 'default_value' => 'zabugomeuh', 'allowed_values' => null, 'depends_on' => [], 'always_load_in_tables' => false]);
+		$oDateAttribute->SetHostClass('WorkOrder');
+
+		//When
+		$defaultValue = $oDateAttribute->GetDefaultValue();
+		self::AssertLastErrorLogEntryContains("Invalid default value 'zabugomeuh' for field 'start_date' on class 'WorkOrder', defaulting to null", "Last error log entry should contain a meaningful message");
+
+		// Then
+		self::assertNull($defaultValue, 'Invalid default value for Date attribute should give null default value');
+	}
+
 
 	public function testDateTimeNowAsDefaultGivesCurrentDateAsDefaultValue()
 	{
@@ -287,6 +315,7 @@ PHP
 		// Then
 		$sNow = date($oDateAttribute->GetInternalFormat());
 		self::assertEquals($sNow, $defaultValue, 'Now as default value for DateTime attribute should give current date as default value');
+
 	}