diff --git a/Alex's Aspect Ratio Calculator.jar b/Alex's Aspect Ratio Calculator.jar
index 29528fd..230b25f 100644
Binary files a/Alex's Aspect Ratio Calculator.jar and b/Alex's Aspect Ratio Calculator.jar differ
diff --git a/README.md b/README.md
index 8122e0b..d7259b7 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,7 @@ Should work on any desktop operating system that can run Java 8. Designed and bu
 
 Changelog:
 
+- Version 0.4 Alpha - Fixes crash when calculating aspect ratio with "0" as input for width/height
 - Version 0.3 Alpha - Adds input validation for negative numbers
 - Version 0.2 Alpha - Bugfix: Crash when entering non-integer characters
 - Version 0.1 Alpha - Initial Release
@@ -12,12 +13,11 @@ Changelog:
 Known Bugs:
 
 - UI elements can be misaligned
-- Running "calculate" with "0" in fields crashes the application
 
 TODO:
 
-- Toggle switch for dark mode 
-- Add dark mode in error messages
+- Add a toggle switch for dark mode 
+- Add dark mode style inside of error messages
 - Evaluate whether logic to reject numbers that are too large is needed
 - Come up with a way to auto-merge AARC.jar //TODO(s) into readme
 
diff --git a/bin/notalexnoyle/AARC$1.class b/bin/notalexnoyle/AARC$1.class
index 04ae536..2906a58 100644
Binary files a/bin/notalexnoyle/AARC$1.class and b/bin/notalexnoyle/AARC$1.class differ
diff --git a/src/notalexnoyle/AARC.java b/src/notalexnoyle/AARC.java
index b993326..3504a0b 100644
--- a/src/notalexnoyle/AARC.java
+++ b/src/notalexnoyle/AARC.java
@@ -188,30 +188,30 @@ public class AARC {
 			// Final valid integer testing conditional: means IF both fields are valid integers: do this
 			else {
 				
-				// Nested conditionals to display proper error messages based on which fields are negative (therefore, invalid)
+				// Nested conditionals to display proper error messages based on which fields are negative or zero (therefore, invalid)
 				
-				// If width and height are both negative: do this
-				if(Integer.valueOf(widthEntry.getText()) < 0 && Integer.valueOf(heightEntry.getText()) < 0) {
+				// If width and height are both negative or zero: do this
+				if(Integer.valueOf(widthEntry.getText()) <= 0 && Integer.valueOf(heightEntry.getText()) <= 0) {
 					
 					// Display error message with formatted title
-					JOptionPane.showMessageDialog(null, "It is not possible to have a negative width and height. Please enter positive values and try again.", "Error", JOptionPane.INFORMATION_MESSAGE); 
+					JOptionPane.showMessageDialog(null, "Please enter a width and height larger than zero.", "Error", JOptionPane.INFORMATION_MESSAGE); 
 					
 				}
-				// If only width is negative: do this
-				else if(Integer.valueOf(widthEntry.getText()) < 0 && Integer.valueOf(heightEntry.getText()) >= 0) { 
+				// If only width is negative or zero: do this
+				else if(Integer.valueOf(widthEntry.getText()) <= 0 && Integer.valueOf(heightEntry.getText()) > 0) { 
 					
 					// Display error message with formatted title
-					JOptionPane.showMessageDialog(null, "It is not possible to have a negative width. Please enter a positive value and try again.", "Error", JOptionPane.INFORMATION_MESSAGE);
+					JOptionPane.showMessageDialog(null, "Please enter a width larger than zero.", "Error", JOptionPane.INFORMATION_MESSAGE);
 					
 				}
-				// If only height is negative: do this
-				else if(Integer.valueOf(heightEntry.getText()) < 0 && Integer.valueOf(widthEntry.getText()) >= 0) {
+				// If only height is negative or zero: do this
+				else if(Integer.valueOf(heightEntry.getText()) <= 0 && Integer.valueOf(widthEntry.getText()) > 0) {
 					
 					// Display error message with formatted title
-					JOptionPane.showMessageDialog(null, "It is not possible to have a negative height. Please enter a positive value and try again", "Error", JOptionPane.INFORMATION_MESSAGE);
+					JOptionPane.showMessageDialog(null, "Please enter a height larger than zero", "Error", JOptionPane.INFORMATION_MESSAGE);
 					
 				}
-				// Final negative number conditional --> If both fields are both valid, positive numbers: do this
+				// Final negative or zero number conditional --> If both fields are both valid, positive, non-zero numbers: do this
 				else {
 					
 					// Set display label to result { pass in user entry Integer derived from String to math methods };