Fix crash caused by invalid config file

Author: comp500

gradle.properties

@@ -8,7 +8,7 @@ org.gradle.jvmargs=-Xmx1G
 	loader_version=0.12.6
 
 # Mod Properties
-	mod_version = 1.1.0
+	mod_version = 1.1.1
 	maven_group = link.infra.borderlessmining
 	archives_base_name = borderless-mining
 

src/main/java/link/infra/borderlessmining/mixin/WindowMixin.java

@@ -118,10 +118,13 @@ private boolean borderlessmining_setBorderlessFullscreen(boolean newValue) {
 						borderlessFullscreen = false;
 						return false;
 					}
+					long monitorHandle;
 					if (ConfigHandler.getInstance().forceWindowMonitor >= monitors.limit()) {
 						LOGGER.warn("Monitor " + ConfigHandler.getInstance().forceWindowMonitor + " is greater than list size " + monitors.limit() + ", using monitor 0");
+						monitorHandle = monitors.get(0);
+					} else {
+						monitorHandle = monitors.get(ConfigHandler.getInstance().forceWindowMonitor);
 					}
-					long monitorHandle = monitors.get(ConfigHandler.getInstance().forceWindowMonitor);
 					try (MemoryStack stack = MemoryStack.stackPush()) {
 						IntBuffer xBuf = stack.mallocInt(1);
 						IntBuffer yBuf = stack.mallocInt(1);