diff --git a/modules/nwtc-library/src/NWTC_IO.f90 b/modules/nwtc-library/src/NWTC_IO.f90
index 937b27195b..77c3dd14fa 100644
--- a/modules/nwtc-library/src/NWTC_IO.f90
+++ b/modules/nwtc-library/src/NWTC_IO.f90
@@ -4111,7 +4111,9 @@ subroutine InitFileInfo_FromNullCString(FileString, FileInfo, ErrStat, ErrMsg)
          NullLoc = index(FileString(idx:len(FileString)),C_NULL_CHAR)
          ! started indexing at idx, so add that back in for location in FileString
          NullLoc = NullLoc + idx - 1
-         if (NullLoc > idx) then
+         if (NullLoc == idx) then   ! blank line
+            FileStringArray(Line) = ''
+         elseif (NullLoc > idx) then
             FileStringArray(Line) = trim(FileString(idx:NullLoc-1))
          else
             ! If not NULL terminated
diff --git a/reg_tests/r-test b/reg_tests/r-test
index b7058644e7..c782721e43 160000
--- a/reg_tests/r-test
+++ b/reg_tests/r-test
@@ -1 +1 @@
-Subproject commit b7058644e7eaec3f823181b508ac345b6cc32d37
+Subproject commit c782721e43705f27b9996a1ee5cdae548ff9c040