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Hi,

With Pfc of current master (7f614bd).

```
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7f3d248f1700 (LWP 19214)]
XrdPfc::File::DeltaStatsFromLastCall (this=0x0) at /usr/src/debug/xrootd/xrootd/src/XrdPfc/XrdPfcFile.cc:145
145	   Stats delta = m_last_stats;
(gdb) where
#0  XrdPfc::File::DeltaStatsFromLastCall (this=0x0) at /usr/src/debug/xrootd/xrootd/src/XrdPfc/XrdPfcFile.cc:145
#1  0x00007f3d25f38143 in XrdPfc::Cache::copy_out_active_stats_and_update_data_fs_state (this=this@entry=
    0xb5e5d0) at /usr/src/debug/xrootd/xrootd/src/XrdPfc/XrdPfcPurge.cc:567
#2  0x00007f3d25f3ba3c in XrdPfc::Cache::Purge (this=0xb5e5d0)
    at /usr/src/debug/xrootd/xrootd/src/XrdPfc/XrdPfcPurge.cc:781
#3  0x00007f3d25f2e901 in PurgeThread () at /usr/src/debug/xrootd/xrootd/src/XrdPfc/XrdPfc.cc:59
#4  0x00007f3d2d5f2977 in XrdSysThread_Xeq (myargs=0xb61950)
    at /usr/src/debug/xrootd/xrootd/src/XrdSys/XrdSysPthread.cc:86
#5  0x00007f3d2d19eea5 in start_thread () from /lib64/libpthread.so.0
#6  0x00007f3d2c49f96d in clone () from /lib64/libc.so.6
```

Opening PR with one possible fix.

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