Fix nullable log names

src/ActivityLogger.php

@@ -120,14 +120,14 @@ public function createdAt(DateTimeInterface $dateTime): static
         return $this;
     }
 
-    public function useLog(string $logName): static
+    public function useLog(?string $logName): static
     {
         $this->getActivity()->log_name = $logName;
 
         return $this;
     }
 
-    public function inLog(string $logName): static
+    public function inLog(?string $logName): static
     {
         return $this->useLog($logName);
     }

src/LogOptions.php

@@ -137,7 +137,7 @@ public function submitEmptyLogs(): self
     /**
      * Customize log name.
      */
-    public function useLogName(string $logName): self
+    public function useLogName(?string $logName): self
     {
         $this->logName = $logName;
 

src/Traits/LogsActivity.php

@@ -128,7 +128,7 @@ public function getDescriptionForEvent(string $eventName): string
         return $eventName;
     }
 
-    public function getLogNameToUse(): string
+    public function getLogNameToUse(): ?string
     {
         if (! empty($this->activitylogOptions->logName)) {
             return $this->activitylogOptions->logName;

tests/ActivityLoggerTest.php

@@ -26,6 +26,14 @@
     expect($this->getLastActivity())->toBeNull();
 });
 
+it('will log activity with a null log name', function () {
+    config(['activitylog.default_log_name' => null]);
+
+    activity()->log($this->activityDescription);
+
+    expect($this->getLastActivity()->log_name)->toBeNull();
+});
+
 it('will log an activity when enabled option is null', function () {
     config(['activitylog.enabled' => null]);