diff --git a/Build/phpstan/phpstan-baseline.neon b/Build/phpstan/phpstan-baseline.neon
index 08823793d7ab04bd2a2a5c5b021d38f14b7e8473..6a79a499b58b5b4cdcdc3fc028e8dfab9f430988 100644
--- a/Build/phpstan/phpstan-baseline.neon
+++ b/Build/phpstan/phpstan-baseline.neon
@@ -1415,16 +1415,6 @@ parameters:
 			count: 8
 			path: ../../typo3/sysext/frontend/Classes/Imaging/GifBuilder.php
 
-		-
-			message: "#^Negated boolean expression is always false\\.$#"
-			count: 3
-			path: ../../typo3/sysext/frontend/Classes/Imaging/GifBuilder.php
-
-		-
-			message: "#^Result of && is always false\\.$#"
-			count: 3
-			path: ../../typo3/sysext/frontend/Classes/Imaging/GifBuilder.php
-
 		-
 			message: "#^Cannot unset offset 'parameter\\.' on array\\{parameter\\: mixed\\}\\.$#"
 			count: 1
diff --git a/typo3/sysext/frontend/Classes/Imaging/GifBuilder.php b/typo3/sysext/frontend/Classes/Imaging/GifBuilder.php
index a8871e5d156237b1e42e61f408ab31e061ea19eb..16a7c262c8528327c7fc0b55b0251c2b41d9ed78 100644
--- a/typo3/sysext/frontend/Classes/Imaging/GifBuilder.php
+++ b/typo3/sysext/frontend/Classes/Imaging/GifBuilder.php
@@ -547,7 +547,7 @@ class GifBuilder
                                 $isStdWrapped = [];
                                 foreach ($conf['shadow.'] as $key => $value) {
                                     $parameter = rtrim($key, '.');
-                                    if (!$isStdWrapped[$parameter] && isset($conf[$parameter . '.'])) {
+                                    if (!($isStdWrapped[$parameter] ?? false) && isset($conf[$parameter . '.'])) {
                                         $conf['shadow.'][$parameter] = $this->cObj->stdWrapValue($parameter, $conf);
                                         $isStdWrapped[$parameter] = 1;
                                     }
@@ -558,7 +558,7 @@ class GifBuilder
                                 $isStdWrapped = [];
                                 foreach ($conf['emboss.'] as $key => $value) {
                                     $parameter = rtrim($key, '.');
-                                    if (!$isStdWrapped[$parameter] && isset($conf[$parameter . '.'])) {
+                                    if (!($isStdWrapped[$parameter] ?? false) && isset($conf[$parameter . '.'])) {
                                         $conf['emboss.'][$parameter] = $this->cObj->stdWrapValue($parameter, $conf);
                                         $isStdWrapped[$parameter] = 1;
                                     }
@@ -569,7 +569,7 @@ class GifBuilder
                                 $isStdWrapped = [];
                                 foreach ($conf['outline.'] as $key => $value) {
                                     $parameter = rtrim($key, '.');
-                                    if (!$isStdWrapped[$parameter] && isset($conf[$parameter . '.'])) {
+                                    if (!($isStdWrapped[$parameter] ?? false) && isset($conf[$parameter . '.'])) {
                                         $conf['outline.'][$parameter] = $this->cObj->stdWrapValue($parameter, $conf);
                                         $isStdWrapped[$parameter] = 1;
                                     }