diff --git a/src/LockBox.ts b/src/LockBox.ts
index f287352..cdf2627 100644
--- a/src/LockBox.ts
+++ b/src/LockBox.ts
@@ -235,7 +235,7 @@ class LockBox<L extends Lockable = Lockable> implements Lockable {
         signal.addEventListener(
           'abort',
           () => {
-            waitPs.reverse();
+            void waitPs.reverse();
             for (const waitP of waitPs) {
               waitP.cancel(signal.reason);
             }
diff --git a/src/Monitor.ts b/src/Monitor.ts
index 6d05bbf..2ff2488 100644
--- a/src/Monitor.ts
+++ b/src/Monitor.ts
@@ -310,7 +310,7 @@ class Monitor<RWLock extends RWLockReader | RWLockWriter> implements Lockable {
         signal.addEventListener(
           'abort',
           () => {
-            waitPs.reverse();
+            void waitPs.reverse();
             for (const waitP of waitPs) {
               waitP.cancel(signal.reason);
             }
diff --git a/src/RWLockReader.ts b/src/RWLockReader.ts
index 85055af..880f163 100644
--- a/src/RWLockReader.ts
+++ b/src/RWLockReader.ts
@@ -218,8 +218,6 @@ class RWLockReader implements Lockable {
     } else {
       if (typeof params[0] === 'string') {
         type = params.shift() as 'read' | 'write';
-      } else if (typeof params[0] == null) {
-        params.shift();
       }
     }
     type = type! ?? 'write';
@@ -268,8 +266,6 @@ class RWLockReader implements Lockable {
     } else {
       if (typeof params[0] === 'string') {
         type = params.shift() as 'read' | 'write';
-      } else if (typeof params[0] == null) {
-        params.shift();
       }
     }
     type = type! ?? 'write';
diff --git a/src/RWLockWriter.ts b/src/RWLockWriter.ts
index c8d965a..d281cc5 100644
--- a/src/RWLockWriter.ts
+++ b/src/RWLockWriter.ts
@@ -219,8 +219,6 @@ class RWLockWriter implements Lockable {
     } else {
       if (typeof params[0] === 'string') {
         type = params.shift() as 'read' | 'write';
-      } else if (typeof params[0] == null) {
-        params.shift();
       }
     }
     type = type! ?? 'write';
@@ -269,8 +267,6 @@ class RWLockWriter implements Lockable {
     } else {
       if (typeof params[0] === 'string') {
         type = params.shift() as 'read' | 'write';
-      } else if (typeof params[0] == null) {
-        params.shift();
       }
     }
     type = type! ?? 'write';