diff --git a/core/src/main/java/it/cavallium/warppi/gui/screens/MathInputScreen.java b/core/src/main/java/it/cavallium/warppi/gui/screens/MathInputScreen.java
index 41c9d86f..96195e0d 100644
--- a/core/src/main/java/it/cavallium/warppi/gui/screens/MathInputScreen.java
+++ b/core/src/main/java/it/cavallium/warppi/gui/screens/MathInputScreen.java
@@ -393,9 +393,11 @@ public class MathInputScreen extends Screen {
 								return true;
 							case SURD_MODE:
 								calc.exactMode = !calc.exactMode;
-								result.clear();
-								currentStep = 0;
-								Keyboard.keyPressed(Key.SIMPLIFY);
+								if (!result.isContentEmpty()) {
+									result.clear();
+									currentStep = 0;
+									Keyboard.keyPressed(Key.SIMPLIFY);
+								}
 								return true;
 							case debug1:
 								Engine.INSTANCE.getHardwareDevice().getDisplayManager().setScreen(new EmptyScreen());
diff --git a/pom.xml b/pom.xml
index 19f05189..51b68d84 100755
--- a/pom.xml
+++ b/pom.xml
@@ -27,7 +27,7 @@
 	</scm>
 
 	<properties>
-		<project.version>0.8-SNAPSHOT</project.version>
+		<project.version>0.9-SNAPSHOT</project.version>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<maven.compiler.source>1.8</maven.compiler.source>
 		<maven.compiler.target>1.8</maven.compiler.target>