diff --git a/napier/src/commonMain/kotlin/io/github/aakira/napier/Napier.kt b/napier/src/commonMain/kotlin/io/github/aakira/napier/Napier.kt
index d8ebce4..ca5022c 100644
--- a/napier/src/commonMain/kotlin/io/github/aakira/napier/Napier.kt
+++ b/napier/src/commonMain/kotlin/io/github/aakira/napier/Napier.kt
@@ -61,7 +61,7 @@ object Napier {
      * @param tag String: Used to identify the source of a log message. It usually
      * identifies the class or activity where the log call occurs. This value may be null.
      */
-    fun v(message: String, throwable: Throwable? = null, tag: String? = null) {
+    fun v(message: String?, throwable: Throwable? = null, tag: String? = null) {
         log(LogLevel.VERBOSE, tag, throwable, message)
     }
 
@@ -73,7 +73,7 @@ object Napier {
      * @param message Lambda: The message you would like logged. This value cannot be null.
      */
     fun v(throwable: Throwable? = null, tag: String? = null, message: () -> String) {
-        log(LogLevel.VERBOSE, tag, throwable, message())
+        log(LogLevel.VERBOSE, tag, throwable, message)
     }
 
     /** Send a INFO log message and log the exception.
@@ -83,7 +83,7 @@ object Napier {
      * @param tag String: Used to identify the source of a log message. It usually
      * identifies the class or activity where the log call occurs. This value may be null.
      */
-    fun i(message: String, throwable: Throwable? = null, tag: String? = null) {
+    fun i(message: String?, throwable: Throwable? = null, tag: String? = null) {
         log(LogLevel.INFO, tag, throwable, message)
     }
 
@@ -95,7 +95,7 @@ object Napier {
      * @param message Lambda: The message you would like logged. This value cannot be null.
      */
     fun i(throwable: Throwable? = null, tag: String? = null, message: () -> String) {
-        log(LogLevel.INFO, tag, throwable, message())
+        log(LogLevel.INFO, tag, throwable, message)
     }
 
     /** Send a DEBUG log message and log the exception.
@@ -105,7 +105,7 @@ object Napier {
      * @param tag String: Used to identify the source of a log message. It usually
      * identifies the class or activity where the log call occurs. This value may be null.
      */
-    fun d(message: String, throwable: Throwable? = null, tag: String? = null) {
+    fun d(message: String?, throwable: Throwable? = null, tag: String? = null) {
         log(LogLevel.DEBUG, tag, throwable, message)
     }
 
@@ -117,7 +117,7 @@ object Napier {
      * @param message Lambda: The message you would like logged. This value cannot be null.
      */
     fun d(throwable: Throwable? = null, tag: String? = null, message: () -> String) {
-        log(LogLevel.DEBUG, tag, throwable, message())
+        log(LogLevel.DEBUG, tag, throwable, message)
     }
 
     /** Send a WARN log message and log the exception.
@@ -127,7 +127,7 @@ object Napier {
      * @param tag String: Used to identify the source of a log message. It usually
      * identifies the class or activity where the log call occurs. This value may be null.
      */
-    fun w(message: String, throwable: Throwable? = null, tag: String? = null) {
+    fun w(message: String?, throwable: Throwable? = null, tag: String? = null) {
         log(LogLevel.WARNING, tag, throwable, message)
     }
 
@@ -139,7 +139,7 @@ object Napier {
      * @param message Lambda: The message you would like logged. This value cannot be null.
      */
     fun w(throwable: Throwable? = null, tag: String? = null, message: () -> String) {
-        log(LogLevel.WARNING, tag, throwable, message())
+        log(LogLevel.WARNING, tag, throwable, message)
     }
 
     /** Send a ERROR log message and log the exception.
@@ -149,7 +149,7 @@ object Napier {
      * @param tag String: Used to identify the source of a log message. It usually
      * identifies the class or activity where the log call occurs. This value may be null.
      */
-    fun e(message: String, throwable: Throwable? = null, tag: String? = null) {
+    fun e(message: String?, throwable: Throwable? = null, tag: String? = null) {
         log(LogLevel.ERROR, tag, throwable, message)
     }
 
@@ -161,7 +161,7 @@ object Napier {
      * @param message Lambda: The message you would like logged. This value cannot be null.
      */
     fun e(throwable: Throwable? = null, tag: String? = null, message: () -> String) {
-        log(LogLevel.ERROR, tag, throwable, message())
+        log(LogLevel.ERROR, tag, throwable, message)
     }
 
     /** What a Terrible Failure: Report an exception that should never happen.
@@ -171,7 +171,7 @@ object Napier {
      * @param tag String: Used to identify the source of a log message. It usually
      * identifies the class or activity where the log call occurs. This value may be null.
      */
-    fun wtf(message: String, throwable: Throwable? = null, tag: String? = null) {
+    fun wtf(message: String?, throwable: Throwable? = null, tag: String? = null) {
         log(LogLevel.ASSERT, tag, throwable, message)
     }
 
@@ -183,7 +183,7 @@ object Napier {
      * @param message Lambda: The message you would like logged. This value cannot be null.
      */
     fun wtf(throwable: Throwable? = null, tag: String? = null, message: () -> String) {
-        log(LogLevel.ASSERT, tag, throwable, message())
+        log(LogLevel.ASSERT, tag, throwable, message)
     }
 
     /** Low-level logging call.
@@ -199,13 +199,33 @@ object Napier {
         priority: LogLevel,
         tag: String? = null,
         throwable: Throwable? = null,
-        message: String
+        message: String?
     ) {
         if (isEnable(priority, tag)) {
             rawLog(priority, tag, throwable, message)
         }
     }
 
+    /** Low-level logging call.
+     *
+     * @param priority enum: The priority/type of this log message Value is ASSERT,
+     * ERROR, WARN, INFO, DEBUG, or VERBOSE
+     * @param tag String: Used to identify the source of a log message. It usually
+     * identifies the class or activity where the log call occurs. This value may be null.
+     * @param throwable Throwable: An exception to log This value may be null.
+     * @param message String: The message you would like logged. This value cannot be null.
+     */
+    fun log(
+        priority: LogLevel,
+        tag: String? = null,
+        throwable: Throwable? = null,
+        message: () -> String
+    ) {
+        if (isEnable(priority, tag)) {
+            rawLog(priority, tag, throwable, message())
+        }
+    }
+
     /** Remove antilog from the base array. */
     fun takeLogarithm(antilog: Antilog) {
         baseArray.remove(antilog)
@@ -239,5 +259,5 @@ fun log(
     tag: String? = null,
     message: () -> String,
 ) {
-    Napier.log(priority, tag, throwable, message())
+    Napier.log(priority, tag, throwable, message)
 }