diff --git a/psalm-baseline.xml b/psalm-baseline.xml
index d59c5237..d0aee7ed 100644
--- a/psalm-baseline.xml
+++ b/psalm-baseline.xml
@@ -25,9 +25,6 @@
     </TypeDoesNotContainType>
   </file>
   <file src="src/AbstractFilter.php">
-    <DocblockTypeContradiction>
-      <code><![CDATA[gettype($options)]]></code>
-    </DocblockTypeContradiction>
     <InvalidPropertyAssignmentValue>
       <code><![CDATA[[]]]></code>
     </InvalidPropertyAssignmentValue>
@@ -37,9 +34,6 @@
     <PossiblyInvalidPropertyAssignmentValue>
       <code><![CDATA[$this->options]]></code>
     </PossiblyInvalidPropertyAssignmentValue>
-    <RedundantConditionGivenDocblockType>
-      <code><![CDATA[is_object($options)]]></code>
-    </RedundantConditionGivenDocblockType>
   </file>
   <file src="src/AbstractUnicode.php">
     <DeprecatedClass>
@@ -394,13 +388,6 @@
     </RedundantCastGivenDocblockType>
   </file>
   <file src="src/Compress/Zip.php">
-    <InvalidArgument>
-      <code><![CDATA[$res]]></code>
-      <code><![CDATA[$res]]></code>
-      <code><![CDATA[$res]]></code>
-      <code><![CDATA[$res]]></code>
-      <code><![CDATA[$res]]></code>
-    </InvalidArgument>
     <InvalidNullableReturnType>
       <code><![CDATA[string]]></code>
     </InvalidNullableReturnType>
@@ -2078,7 +2065,6 @@
     <PossiblyUnusedMethod>
       <code><![CDATA[objectCallback]]></code>
       <code><![CDATA[objectCallbackWithParams]]></code>
-      <code><![CDATA[staticCallback]]></code>
     </PossiblyUnusedMethod>
   </file>
   <file src="test/TestAsset/LowerCase.php">
diff --git a/src/Inflector.php b/src/Inflector.php
index 14fe7079..27c83c5d 100644
--- a/src/Inflector.php
+++ b/src/Inflector.php
@@ -290,7 +290,10 @@ public function getRules($spec = null)
     {
         if (null !== $spec) {
             $spec = $this->_normalizeSpec($spec);
-            return $this->rules[$spec] ?? false;
+            if (isset($this->rules[$spec])) {
+                return $this->rules[$spec];
+            }
+            return false;
         }
 
         return $this->rules;