X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Flanguage%2Fstats%2Froc.c;fp=src%2Flanguage%2Fstats%2Froc.c;h=b3841634378f30503c5e614f3387faeb3c3d144d;hb=ef05e82c1e224ccfc24594ffc41a155a585276d5;hp=054289f1d61ae0bf9e80acac13c88f85c8a86202;hpb=719074919206c376cf4b0971213caa173af22c89;p=pspp-builds.git

diff --git a/src/language/stats/roc.c b/src/language/stats/roc.c
index 054289f1..b3841634 100644
--- a/src/language/stats/roc.c
+++ b/src/language/stats/roc.c
@@ -474,6 +474,8 @@ do_roc (struct cmd_roc *roc, struct casereader *input, struct dictionary *dict)
 		case_unref (cneg);
 
 	      cneg = casereader_read (n_neg);
+	      if ( ! cneg )
+		break;
 	      dneg = case_data_idx (cneg, VALUE)->f;
 	    }