Bug Report
https://issues.apache.org/bugzilla/show_bug.cgi?id=29
Source Code
http://archive.apache.org/dist/logging/log4j/1.0.2/jakarta-log4j-1.0.2.zip
EvoCrash Target Frame
2
java.lang.NullPointerException:
    at org.apache.log4jb.Category.forcedLog(Category.java:453)
    at org.apache.log4jb.Category.error(Category.java:368)
public void test0() throws Throwable {
    Class class0 = Integer.class;
    Category category0 = Category.getInstance(class0);
    Hierarchy hierarchy0 = Category.getDefaultHierarchy();
    category0.debug((Object) hierarchy0);
}

The log line are updated accoring to the closest version of Log4j we could find.