diff --git a/launcher-gtk/src/main/kotlin/io/gitlab/jfronny/inceptum/gtk/util/Log.kt b/launcher-gtk/src/main/kotlin/io/gitlab/jfronny/inceptum/gtk/util/Log.kt
index e349de9..4750d2f 100644
--- a/launcher-gtk/src/main/kotlin/io/gitlab/jfronny/inceptum/gtk/util/Log.kt
+++ b/launcher-gtk/src/main/kotlin/io/gitlab/jfronny/inceptum/gtk/util/Log.kt
@@ -12,24 +12,36 @@ object GtkLog : LogWriterFunc {
     // Based on https://github.com/jwharm/java-gi-examples/blob/6e08b4d2e62998c53d855b32433513308e01e82d/Logging/src/main/java/io/github/jwharm/javagi/examples/logging/SLF4JLogWriterFunc.java
     // Original license: LGPL-2.1, written by Jan-Willem Harmannij
     override fun run(logLevel: Set<LogLevelFlags>, fields: Array<LogField>): LogWriterOutput {
-        val level = logLevel.firstOrNull()?.let { convertLevel(it) } ?: return LogWriterOutput.UNHANDLED
-        val domain = readStringFromKey("GLIB_DOMAIN", fields) ?: return LogWriterOutput.UNHANDLED
-        val message = readStringFromKey("MESSAGE", fields) ?: return LogWriterOutput.UNHANDLED
-        val source = readStringFromKey("CODE_FILE", fields) ?: "<unknown>"
-        val func = readStringFromKey("CODE_FUNC", fields)?.let { "::$it" } ?: ""
-        val line = readStringFromKey("CODE_LINE", fields)?.let { ":$it" } ?: ""
-        System.getLogger(domain).log(level, "$source$func$line: $message")
+        val level = logLevel.asSequence()
+            .map { when (it) {
+                LogLevelFlags.LEVEL_ERROR, LogLevelFlags.LEVEL_CRITICAL -> System.Logger.Level.ERROR
+                LogLevelFlags.LEVEL_WARNING -> System.Logger.Level.WARNING
+                LogLevelFlags.LEVEL_MESSAGE, LogLevelFlags.LEVEL_INFO -> System.Logger.Level.INFO
+                LogLevelFlags.LEVEL_DEBUG -> System.Logger.Level.DEBUG
+                else -> null
+            } }
+            .filterNotNull()
+            .maxByOrNull(System.Logger.Level::ordinal)
+            ?: return LogWriterOutput.UNHANDLED
+        var domain: String? = null
+        var file: String? = null
+        var func: String? = null
+        var line: String? = null
+        var message: String? = null
+        for (field in fields) {
+            when (field.readKey()) {
+                "GLIB_DOMAIN" -> domain = field.readString()
+                "CODE_FILE" -> file = field.readString()
+                "CODE_FUNC" -> func = "::${field.readString()}"
+                "CODE_LINE" -> line = ":${field.readString()}"
+                "MESSAGE" -> message = field.readString()
+            }
+        }
+        if (domain == null || message == null) return LogWriterOutput.UNHANDLED
+        System.getLogger(domain).log(level, "{0}{1}{2}: {3}", file ?: "<unknown>", line ?: "", func ?: "", message)
         return LogWriterOutput.HANDLED
     }
 
-    private fun convertLevel(flag: LogLevelFlags) = when (flag) {
-        LogLevelFlags.LEVEL_ERROR, LogLevelFlags.LEVEL_CRITICAL -> System.Logger.Level.ERROR
-        LogLevelFlags.LEVEL_WARNING -> System.Logger.Level.WARNING
-        LogLevelFlags.LEVEL_MESSAGE, LogLevelFlags.LEVEL_INFO -> System.Logger.Level.INFO
-        LogLevelFlags.LEVEL_DEBUG -> System.Logger.Level.DEBUG
-        else -> null
-    }
-    private fun readStringFromKey(key: String, logFields: Array<LogField>) = logFields.firstOrNull { it.readKey() == key }?.readString()
     private fun LogField.readString(): String {
         val length = readLength()
         return readValue().reinterpret(if (length == -1L) Long.MAX_VALUE else length).getString(0)