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-rw-r--r--src/base/io/io.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/base/io/io.c b/src/base/io/io.c
index 551feb0b..e1ff3b08 100644
--- a/src/base/io/io.c
+++ b/src/base/io/io.c
@@ -825,7 +825,7 @@ int IoCommandReadTruth( Abc_Frame_t * pAbc, int argc, char ** argv )
pSopCover = Abc_SopFromTruthHex(argv[globalUtilOptind]);
else
pSopCover = Abc_SopFromTruthBin(argv[globalUtilOptind]);
- if ( pSopCover == NULL )
+ if ( pSopCover == NULL || pSopCover[0] == 0 )
{
fprintf( pAbc->Err, "Reading truth table has failed.\n" );
return 1;