diff --git a/4dev/tests/Convert/CoreLibsConvertJsonTest.php b/4dev/tests/Convert/CoreLibsConvertJsonTest.php
index cdfc74a1..0363357f 100644
--- a/4dev/tests/Convert/CoreLibsConvertJsonTest.php
+++ b/4dev/tests/Convert/CoreLibsConvertJsonTest.php
@@ -277,6 +277,38 @@ final class CoreLibsConvertJsonTest extends TestCase
 		);
 	}
 
+	/**
+	 * Check if invalid flag throws exception
+	 *
+	 * @covers ::jsonValidate
+	 * @testdox jsonValidate test exception thrown on invalid flag
+	 *
+	 * @return void
+	 */
+	public function testJsonValidateInvalidFlag(): void
+	{
+		$this->expectException("\InvalidArgumentException");
+		\CoreLibs\Convert\Json::jsonValidate('{"valid": "json"}', 5);
+	}
+
+	/**
+	 * Check if valid flag throws no exception
+	 *
+	 * @covers ::jsonValidate
+	 * @testdox jsonValidate test no exception on valid flag
+	 *
+	 * @return void
+	 */
+	public function testJsonValidateValidflag(): void
+	{
+		$this->assertTrue(
+			\CoreLibs\Convert\Json::jsonValidate('{"valid": "json"}', 0)
+		);
+		$this->assertTrue(
+			\CoreLibs\Convert\Json::jsonValidate('{"valid": "json"}', JSON_INVALID_UTF8_IGNORE)
+		);
+	}
+
 	/**
 	 * Undocumented function
 	 *
diff --git a/www/lib/CoreLibs/Combined/DateTime.php b/www/lib/CoreLibs/Combined/DateTime.php
index dab0658e..18e66190 100644
--- a/www/lib/CoreLibs/Combined/DateTime.php
+++ b/www/lib/CoreLibs/Combined/DateTime.php
@@ -133,7 +133,7 @@ class DateTime
 		} else {
 			for ($i = 0, $iMax = count($timegroups); $i < $iMax; $i++) {
 				$output = floor((float)$timestamp / $timegroups[$i]);
-				$timestamp = (float)$timestamp % $timegroups[$i];
+				$timestamp = $timestamp % $timegroups[$i];
 				// output has days|hours|min|sec
 				if ($output || $time_string) {
 					$time_string .= $output . $labels[$i] . (($i + 1) != count($timegroups) ? ' ' : '');
@@ -453,7 +453,7 @@ class DateTime
 		}
 		if (isset($matches[11]) && is_numeric($matches[11])) {
 			// for milliseconds, we need to divide by 1000 and add them
-			$timestamp += (float)($matches[11] / 1000);
+			$timestamp += ((float)$matches[11] / 1000);
 		}
 		if ($negative) {
 			// cast to float so we can do a negative multiplication
diff --git a/www/lib/CoreLibs/Convert/Byte.php b/www/lib/CoreLibs/Convert/Byte.php
index a9ddbd99..651d70f5 100644
--- a/www/lib/CoreLibs/Convert/Byte.php
+++ b/www/lib/CoreLibs/Convert/Byte.php
@@ -154,7 +154,7 @@ class Byte
 		if (!empty($matches[1])) {
 			$number_negative = true;
 		}
-		if (isset($matches[2]) && isset($matches[3])) {
+		if (isset($matches[2])) {
 			// remove all non valid characters from the number
 			$number = preg_replace('/[^0-9\.]/', '', $matches[2]);
 			// final clean up and convert to float
diff --git a/www/lib/CoreLibs/Convert/Color/Color.php b/www/lib/CoreLibs/Convert/Color/Color.php
index 016d71af..02dca1e2 100644
--- a/www/lib/CoreLibs/Convert/Color/Color.php
+++ b/www/lib/CoreLibs/Convert/Color/Color.php
@@ -957,9 +957,9 @@ class Color
 	 * Undocumented function
 	 *
 	 * @param  HWB $hwb
-	 * @return Lch
+	 * @return LCH
 	 */
-	public static function hwbToLch(HWB $hwb): Lch
+	public static function hwbToLch(HWB $hwb): LCH
 	{
 		return self::rgbToLch(
 			self::hwbToRgb($hwb)
@@ -1078,10 +1078,10 @@ class Color
 	/**
 	 * OkLab to Lch (CIE)
 	 *
-	 * @param  LAB $lab
+	 * @param  Lab $lab
 	 * @return LCH
 	 */
-	public static function okLabToLch(LAB $lab): LCH
+	public static function okLabToLch(Lab $lab): LCH
 	{
 		return self::labToLch(
 			self::okLabToLab($lab)
@@ -1092,9 +1092,9 @@ class Color
 	 * Lch (CIE) to OkLab
 	 *
 	 * @param  LCH $lch
-	 * @return LAB
+	 * @return Lab
 	 */
-	public static function lchToOkLab(LCH $lch): LAB
+	public static function lchToOkLab(LCH $lch): Lab
 	{
 		return self::labToOkLab(
 			self::lchToLab($lch)
diff --git a/www/lib/CoreLibs/Convert/Json.php b/www/lib/CoreLibs/Convert/Json.php
index 32c42364..bddbcae2 100644
--- a/www/lib/CoreLibs/Convert/Json.php
+++ b/www/lib/CoreLibs/Convert/Json.php
@@ -74,11 +74,15 @@ class Json
 	 * Weill set the internval last error state and info can be read with jsonGetLastError
 	 *
 	 * @param  string $json
-	 * @param  int    $flags only JSON_INVALID_UTF8_IGNORE is currently allowed
+	 * @param  int $flags only JSON_INVALID_UTF8_IGNORE is currently allowed
 	 * @return bool
+	 * @throws \InvalidArgumentException if flags is invalid
 	 */
 	public static function jsonValidate(string $json, int $flags = 0): bool
 	{
+		if ($flags != 0 && $flags != JSON_INVALID_UTF8_IGNORE) {
+			throw new \InvalidArgumentException("For flag only 0 or JSON_INVALID_UTF8_IGNORE is allwed: " . $flags);
+		}
 		$json_valid = json_validate($json, flags:$flags);
 		self::$json_last_error = json_last_error();
 		return $json_valid;
diff --git a/www/lib/CoreLibs/DB/IO.php b/www/lib/CoreLibs/DB/IO.php
index 732d7a27..12673fc3 100644
--- a/www/lib/CoreLibs/DB/IO.php
+++ b/www/lib/CoreLibs/DB/IO.php
@@ -2562,21 +2562,27 @@ class IO
 				// set field names
 				$this->cursor_ext[$query_hash]['field_names'] = [];
 				for ($i = 0; $i < $this->cursor_ext[$query_hash]['num_fields']; $i++) {
-					$this->cursor_ext[$query_hash]['field_names'][] =
-						$this->db_functions->__dbFieldName(
+					if (
+						($field_name = $this->db_functions->__dbFieldName(
 							$this->cursor_ext[$query_hash]['cursor'],
 							$i
-						);
+						)) !== false
+					) {
+						$this->cursor_ext[$query_hash]['field_names'][] = $field_name;
+					}
 				}
 				$this->field_names = $this->cursor_ext[$query_hash]['field_names'];
 				// field types
 				$this->cursor_ext[$query_hash]['field_types'] = [];
 				for ($i = 0; $i < $this->cursor_ext[$query_hash]['num_fields']; $i++) {
-					$this->cursor_ext[$query_hash]['field_types'][] =
-						$this->db_functions->__dbFieldType(
+					if (
+						($field_type = $this->db_functions->__dbFieldType(
 							$this->cursor_ext[$query_hash]['cursor'],
 							$i
-						);
+						)) !== false
+					) {
+						$this->cursor_ext[$query_hash]['field_types'][] = $field_type;
+					}
 				}
 				$this->field_types = $this->cursor_ext[$query_hash]['field_types'];
 				// combined name => type
diff --git a/www/lib/CoreLibs/Output/Form/Elements.php b/www/lib/CoreLibs/Output/Form/Elements.php
index 6fbd38ed..7f25e122 100644
--- a/www/lib/CoreLibs/Output/Form/Elements.php
+++ b/www/lib/CoreLibs/Output/Form/Elements.php
@@ -178,11 +178,11 @@ class Elements
 			"/(href=\")?(\>)?\b($protRegex)([\w\.\-?&=+%#~,;\/]+)\b([\.\-?&=+%#~,;\/]*)(\|([^\||^#]+)(#([^\|]+))?\|)?/",
 			function ($matches) {
 				return self::createUrl(
-					$matches[1] ?? '',
-					$matches[2] ?? '',
-					$matches[3] ?? '',
-					$matches[4] ?? '',
-					$matches[5] ?? '',
+					$matches[1],
+					$matches[2],
+					$matches[3],
+					$matches[4],
+					$matches[5],
 					$matches[7] ?? '',
 					$matches[9] ?? ''
 				);