500 Servlet Exception

java.lang.ArithmeticException: / by zero
	at com.ncee.cache.ProductCache.getRandomFeaturedProduct(ProductCache.java:278)
	at com.ncee.taglib.FeaturedProductTag.doStartTag(FeaturedProductTag.java:51)
	at _store._index__jsp._jspService(/store/index.jsp:78)
	at com.caucho.jsp.JavaPage.service(JavaPage.java:75)
	at com.caucho.jsp.Page.subservice(Page.java:485)
	at com.caucho.server.http.FilterChainPage.doFilter(FilterChainPage.java:182)
	at com.caucho.server.http.Invocation.service(Invocation.java:312)
	at com.caucho.server.http.CacheInvocation.service(CacheInvocation.java:135)
	at com.caucho.server.http.RunnerRequest.handleRequest(RunnerRequest.java:342)
	at com.caucho.server.http.RunnerRequest.handleConnection(RunnerRequest.java:272)
	at com.caucho.server.TcpConnection.run(TcpConnection.java:137)
	at java.lang.Thread.run(Thread.java:554)