Additional guards in debug info.

src/core/org/luaj/vm/CallInfo.java

@@ -49,8 +49,9 @@ public class CallInfo {
 	 */
 	public int currentline() {
 		int[] li = closure.p.lineinfo;
-		if ( li != null && pc <= li.length )
-			return li[currentpc()];
+		int pc = currentpc();
+		if ( li != null && pc < li.length )
+			return li[pc];
 		return -1;
 	}
 

src/core/org/luaj/vm/Print.java

@@ -244,7 +244,7 @@ public class Print extends Lua {
 	}
 
 	private static int getline(LPrototype f, int pc) {
-		return f.lineinfo[pc];
+		return pc>0 && f.lineinfo!=null && pc<f.lineinfo.length? f.lineinfo[pc]: -1;
 	}
 
 	static void printHeader(LPrototype f) {