Don't execute Fox-related statements when not in Fox Mode. Protect against a bounds error.

lib/decoder.f90

@@ -517,6 +517,7 @@ contains
     write(13,1002) params%nutc,nint(sync),snr,dt,freq,0,decoded0
 1002 format(i6.6,i4,i5,f6.1,f8.0,i4,3x,a37,' FT8')
 
+    if(ncontest.eq.5) then
        i1=index(decoded0,' ')
        i2=i1 + index(decoded0(i1+1:),' ')
        i3=i2 + index(decoded0(i2+1:),' ')
@@ -539,7 +540,7 @@ contains
              if(n30.lt.n30z) nwrap=nwrap+5760    !New UTC day, handle the wrap
              n30z=n30
              n30=n30+nwrap
-          nfox=nfox+1
+             if(nfox.lt.MAXFOX) nfox=nfox+1
              c2fox(nfox)=c2
              g2fox(nfox)=g2
              nsnrfox(nfox)=snr
@@ -547,6 +548,7 @@ contains
              n30fox(nfox)=n30
           endif
        endif
+    endif
     
     call flush(6)
     call flush(13)