2 files changed, 6 insertions, 0 deletions
diff --git a/gr-digital/lib/pfb_clock_sync_ccf_impl.cc b/gr-digital/lib/pfb_clock_sync_ccf_impl.cc
index 60ee02aea5..c8e1221c90 100644
--- a/gr-digital/lib/pfb_clock_sync_ccf_impl.cc
+++ b/gr-digital/lib/pfb_clock_sync_ccf_impl.cc
@@ -308,6 +308,9 @@ namespace gr {
       // Normalize the taps
       for(unsigned int i = 0; i < difftaps.size(); i++) {
         difftaps[i] *= d_nfilters/pwr;
+        if(difftaps[i] != difftaps[i]) {
+          throw std::runtime_error("pfb_clock_sync_ccf::create_diff_taps produced NaN.");
+        }
       }
     }
 
diff --git a/gr-digital/lib/pfb_clock_sync_fff_impl.cc b/gr-digital/lib/pfb_clock_sync_fff_impl.cc
index 2b73aed699..beb6bf5579 100644
--- a/gr-digital/lib/pfb_clock_sync_fff_impl.cc
+++ b/gr-digital/lib/pfb_clock_sync_fff_impl.cc
@@ -287,6 +287,9 @@ namespace gr {
       // Normalize the taps
       for(unsigned int i = 0; i < difftaps.size(); i++) {
         difftaps[i] *= d_nfilters/pwr;
+        if(difftaps[i] != difftaps[i]) {
+          throw std::runtime_error("pfb_clock_sync_fff::create_diff_taps produced NaN.");
+        }
       }
     }