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--- a/src/internfile/mh_exec.cpp
+++ b/src/internfile/mh_exec.cpp
@@ -42,8 +42,9 @@
 public:
     MEAdv(int maxsecs) : m_filtermaxseconds(maxsecs) {m_start = time(0L);}
     void newData(int n) {
-        LOGDEB1(("MHExec: new data, count %d\n", n));
-        if (time(0L) - m_start > m_filtermaxseconds) {
+        LOGDEB1(("MHExec:newData(%d)\n", n));
+        if (m_filtermaxseconds > 0 && 
+            time(0L) - m_start > m_filtermaxseconds) {
             LOGERR(("MimeHandlerExec: filter timeout (%d S)\n",
                     m_filtermaxseconds));
             CancelCheck::instance().setCancel();