diff --git a/src/main/java/de/neemann/digital/builder/circuit/CircuitBuilder.java b/src/main/java/de/neemann/digital/builder/circuit/CircuitBuilder.java
index 6edd16b59..075aae979 100644
--- a/src/main/java/de/neemann/digital/builder/circuit/CircuitBuilder.java
+++ b/src/main/java/de/neemann/digital/builder/circuit/CircuitBuilder.java
@@ -3,6 +3,7 @@
 import de.neemann.digital.analyse.DetermineJKStateMachine;
 import de.neemann.digital.analyse.expression.*;
 import de.neemann.digital.analyse.expression.Not;
+import de.neemann.digital.analyse.expression.format.FormatterException;
 import de.neemann.digital.builder.BuilderException;
 import de.neemann.digital.builder.BuilderInterface;
 import de.neemann.digital.core.basic.*;
@@ -124,7 +125,7 @@ public CircuitBuilder addSequential(String name, Expression expression) throws B
                         fragments.add(new FragmentExpression(Arrays.asList(frJ, frK), fe));
                     }
                 }
-            } catch (Exception e) {
+            } catch (ExpressionException | FormatterException e) {
                 throw new BuilderException(e.getMessage());
             }
         }
diff --git a/src/main/java/de/neemann/digital/core/element/Keys.java b/src/main/java/de/neemann/digital/core/element/Keys.java
index e43d68476..23e6069a8 100644
--- a/src/main/java/de/neemann/digital/core/element/Keys.java
+++ b/src/main/java/de/neemann/digital/core/element/Keys.java
@@ -40,7 +40,7 @@ private Keys() {
      */
     public static final Key.KeyInteger SIZE
             = new Key.KeyInteger("Size", 1)
-            .setComboBoxValues(new Integer[]{1,2, 3, 4, 5})
+            .setComboBoxValues(new Integer[]{1, 2, 3, 4, 5})
             .setMin(1);
     /**
      * The value of constants