diff --git a/swad_changelog.h b/swad_changelog.h
index a67df9d99..24137ec7b 100644
--- a/swad_changelog.h
+++ b/swad_changelog.h
@@ -189,13 +189,14 @@
 /****************************** Public constants *****************************/
 /*****************************************************************************/
 
-#define Log_PLATFORM_VERSION	"SWAD 16.111.11 (2016-12-29)"
+#define Log_PLATFORM_VERSION	"SWAD 16.111.12 (2016-12-29)"
 #define CSS_FILE		"swad16.111.5.css"
 #define JS_FILE			"swad16.101.js"
 
 // Number of lines (includes comments but not blank lines) has been got with the following command:
 // nl swad*.c swad*.h css/swad*.css py/swad*.py js/swad*.js soap/swad*?.h sql/swad*.sql | tail -1
 /*
+        Version 16.111.12:Dec 29, 2016	Fixed minor bug in groups, reported by Coverity. (? lines)
         Version 16.111.11:Dec 29, 2016	Fixed minor bug inserting links to nicknames, reported by Coverity. (211149 lines)
         Version 16.111.10:Dec 29, 2016	Fixed minor bug in groups, reported by Coverity. (211146 lines)
         Version 16.111.9: Dec 29, 2016	Fixed bugs in lstat, reported by Coverity. (211138 lines)
diff --git a/swad_enrollment.c b/swad_enrollment.c
index fc1abee4b..8ffe70a72 100644
--- a/swad_enrollment.c
+++ b/swad_enrollment.c
@@ -1356,6 +1356,8 @@ static void Enr_ReceiveFormUsrsCrs (Rol_Role_t Role)
 	 Grp_GetListGrpTypesAndGrpsInThisCrs (Grp_ONLY_GROUP_TYPES_WITH_GROUPS);
 
 	 /***** Get the list of groups to which register/remove students *****/
+	 LstGrps.GrpCod = NULL;	// Initialized to avoid bug reported by Coverity
+	 LstGrps.NumGrps = 0;	// Initialized to avoid bug reported by Coverity
 	 Grp_GetLstCodsGrpWanted (&LstGrps);
 
 	 /***** A student can't belong to more than one group when the type of group only allows to register in one group *****/
diff --git a/swad_group.c b/swad_group.c
index b23fad195..49e54ddcb 100644
--- a/swad_group.c
+++ b/swad_group.c
@@ -577,8 +577,8 @@ void Grp_ChangeOtherUsrGrps (void)
    Grp_GetListGrpTypesAndGrpsInThisCrs (Grp_ONLY_GROUP_TYPES_WITH_GROUPS);
 
    /***** Get the list of groups to which register this user *****/
-   // LstGrpsUsrWants.GrpCod = NULL;	// Initialized to avoid bug reported by Coverity
-   // LstGrpsUsrWants.NumGrps = 0;	// Initialized to avoid bug reported by Coverity
+   LstGrpsUsrWants.GrpCod = NULL;	// Initialized to avoid bug reported by Coverity
+   LstGrpsUsrWants.NumGrps = 0;		// Initialized to avoid bug reported by Coverity
    Grp_GetLstCodsGrpWanted (&LstGrpsUsrWants);
 
    /***** A student can not be enrolled in more than one group
@@ -937,8 +937,8 @@ void Grp_RegisterUsrIntoGroups (struct UsrData *UsrDat,struct ListCodGrps *LstGr
       MultipleEnrollment = Gbl.CurrentCrs.Grps.GrpTypes.LstGrpTypes[NumGrpTyp].MultipleEnrollment;
 
       /***** Query in the database the group codes of any group of this type the student belongs to *****/
-      // LstGrpsHeBelongs.NumGrps = 0;	// Initialized to avoid bug reported by Coverity
-      // LstGrpsHeBelongs.GrpCod = NULL;// Initialized to avoid bug reported by Coverity
+      LstGrpsHeBelongs.NumGrps = 0;	// Initialized to avoid bug reported by Coverity
+      LstGrpsHeBelongs.GrpCod = NULL;	// Initialized to avoid bug reported by Coverity
       Grp_GetLstCodGrpsUsrBelongs (Gbl.CurrentCrs.Crs.CrsCod,Gbl.CurrentCrs.Grps.GrpTypes.LstGrpTypes[NumGrpTyp].GrpTypCod,
 	                           UsrDat->UsrCod,&LstGrpsHeBelongs);