diff -r 8852f34a646a -r 92beba8bf1c8 src/luan/LuanTable.java
--- a/src/luan/LuanTable.java	Sun May 23 15:17:25 2021 -0600
+++ b/src/luan/LuanTable.java	Mon May 24 22:30:17 2021 -0600
@@ -11,6 +11,7 @@
 import java.util.Comparator;
 import java.util.Set;
 import java.util.HashSet;
+import java.util.ConcurrentModificationException;
 
 
 public final class LuanTable implements LuanMutable {
@@ -351,11 +352,15 @@
 		return new LuanFunction() {
 			final Iterator<Map.Entry> iter = rawIterator();
 
-			@Override public Object[] call(Luan luan,Object[] args) {
+			@Override public Object[] call(Luan luan,Object[] args) throws LuanException {
 				if( !iter.hasNext() )
 					return LuanFunction.NOTHING;
-				Map.Entry<Object,Object> entry = iter.next();
-				return new Object[]{entry.getKey(),entry.getValue()};
+				try {
+					Map.Entry<Object,Object> entry = iter.next();
+					return new Object[]{entry.getKey(),entry.getValue()};
+				} catch(ConcurrentModificationException e) {
+					throw new LuanException("table modified while iterating");
+				}
 			}
 		};
 	}