diff --git a/pkg/obioptions/version.go b/pkg/obioptions/version.go
index ba9e170..f338b2f 100644
--- a/pkg/obioptions/version.go
+++ b/pkg/obioptions/version.go
@@ -3,7 +3,7 @@ package obioptions
 // Version is automatically updated by the Makefile from version.txt
 // The patch number (third digit) is incremented on each push to the repository
 
-var _Version = "Release 4.4.14"
+var _Version = "Release 4.4.15"
 
 // Version returns the version of the obitools package.
 //
diff --git a/pkg/obitools/obiconvert/sequence_reader.go b/pkg/obitools/obiconvert/sequence_reader.go
index aff14fd..d05c881 100644
--- a/pkg/obitools/obiconvert/sequence_reader.go
+++ b/pkg/obitools/obiconvert/sequence_reader.go
@@ -68,6 +68,8 @@ func ExpandListOfFiles(check_ext bool, filenames ...string) ([]string, error) {
 						strings.HasSuffix(path, "seq.gz") ||
 						strings.HasSuffix(path, "gb") ||
 						strings.HasSuffix(path, "gb.gz") ||
+						strings.HasSuffix(path, "gbff") ||
+						strings.HasSuffix(path, "gbff.gz") ||
 						strings.HasSuffix(path, "dat") ||
 						strings.HasSuffix(path, "dat.gz") ||
 						strings.HasSuffix(path, "ecopcr") ||
@@ -204,7 +206,7 @@ func CLIReadBioSequences(filenames ...string) (obiiter.IBioSequence, error) {
 					iterator = iterator.PairTo(ip)
 				}
 			} else {
-				iterator = obiiter.NilIBioSequence
+				return obiiter.NilIBioSequence, fmt.Errorf("no sequence files found in the provided paths")
 			}
 		}
 
diff --git a/version.txt b/version.txt
index f6d64ee..9613784 100644
--- a/version.txt
+++ b/version.txt
@@ -1 +1 @@
-4.4.14
+4.4.15