2 files changed, 3 insertions, 3 deletions
diff --git a/src/main/java/com/keuin/crosslink/config/GlobalConfigManager.java b/src/main/java/com/keuin/crosslink/config/GlobalConfigManager.java
index a09fc05..362910c 100644
--- a/src/main/java/com/keuin/crosslink/config/GlobalConfigManager.java
+++ b/src/main/java/com/keuin/crosslink/config/GlobalConfigManager.java
@@ -36,7 +36,7 @@ public class GlobalConfigManager {
     public static void initializeGlobalManager(@NotNull File configFileDirectory) throws ConfigLoadException, IOException {
         Objects.requireNonNull(configFileDirectory);
         synchronized (lock) {
-            if (instance == null) {
+            if (instance != null) {
                 throw new IllegalStateException("already initialized");
             }
             instance = new GlobalConfigManager(configFileDirectory);
diff --git a/src/main/java/com/keuin/crosslink/plugin/common/PluginMain.java b/src/main/java/com/keuin/crosslink/plugin/common/PluginMain.java
index 9b0d012..a556f92 100644
--- a/src/main/java/com/keuin/crosslink/plugin/common/PluginMain.java
+++ b/src/main/java/com/keuin/crosslink/plugin/common/PluginMain.java
@@ -73,7 +73,7 @@ public final class PluginMain {
                 rc.configure(messageRouter); // update routing table, clear endpoints
                 logger.debug("Message router is configured successfully.");
             } catch (JsonProcessingException | ConfigSyntaxError ex) {
-                logger.error("Failed to load routing config", ex);
+                logger.error("Failed to load routing config.", ex);
                 throw new RuntimeException(ex);
             }
 
@@ -136,7 +136,7 @@ public final class PluginMain {
         try {
             GlobalConfigManager.initializeGlobalManager(environment.pluginDataPath().toFile());
         } catch (ConfigLoadException | IOException ex) {
-            logger.error("Failed to load configuration", ex);
+            logger.error("Failed to load configuration.", ex);
             throw new RuntimeException(ex);
         }
         logger.info("Config files are loaded.");