diff --git a/swad_MFU.c b/swad_MFU.c
index 4c42fc7f..110f567b 100644
--- a/swad_MFU.c
+++ b/swad_MFU.c
@@ -102,7 +102,8 @@ void MFU_GetMFUActions (struct MFU_ListMFUActions *ListMFUActions,unsigned MaxAc
    extern Act_Action_t Act_FromActCodToAction[1 + Act_MAX_ACTION_COD];
    MYSQL_RES *mysql_res;
    MYSQL_ROW row;
-   unsigned long NumRow,NumRows;
+   unsigned long NumRows;
+   unsigned long NumRow;
    long ActCod;
    Act_Action_t Action;
 
diff --git a/swad_changelog.h b/swad_changelog.h
index 7255c42d..867e7d25 100644
--- a/swad_changelog.h
+++ b/swad_changelog.h
@@ -490,7 +490,7 @@ enscript -2 --landscape --color --file-align=2 --highlight --line-numbers -o - *
 En OpenSWAD:
 ps2pdf source.ps destination.pdf
 */
-#define Log_PLATFORM_VERSION	"SWAD 19.55 (2019-11-07)"
+#define Log_PLATFORM_VERSION	"SWAD 19.55.1 (2019-11-07)"
 #define CSS_FILE		"swad19.47.css"
 #define JS_FILE			"swad19.39.js"
 /*
@@ -498,6 +498,7 @@ ps2pdf source.ps destination.pdf
 // TODO: Impedir la creación y edición de proyectos si no son editables.
 // TODO: Importante: filtrar proyectos por usuarios (igual que en trabajos o en asistencia)
 
+	Version 19.55.1:  Nov 07, 2019	Fixed bug in groups. (246068 lines)
 	Version 19.55:    Nov 07, 2019	Code refactoring in HTML spans.
 				        Fixed bug in groups. (246058 lines)
 	Version 19.54.10: Nov 07, 2019	Code refactoring in HTML select options. (245888 lines)
diff --git a/swad_chat.c b/swad_chat.c
index d69a26d6..3453ea45 100644
--- a/swad_chat.c
+++ b/swad_chat.c
@@ -245,7 +245,8 @@ void Cht_ShowListOfChatRoomsWithUsrs (void)
    extern const char *Txt_No_of_users;
    MYSQL_RES *mysql_res;
    MYSQL_ROW row;
-   unsigned long NumRow,NumRows;
+   unsigned long NumRows;
+   unsigned long NumRow;
 
    /***** Get chat rooms with connected users from database *****/
    NumRows = DB_QuerySELECT (&mysql_res,"can not get chat rooms"
diff --git a/swad_degree.c b/swad_degree.c
index 2ffecfb5..c51b8a20 100644
--- a/swad_degree.c
+++ b/swad_degree.c
@@ -1799,7 +1799,8 @@ void Deg_RemoveDegreeCompletely (long DegCod)
   {
    MYSQL_RES *mysql_res;
    MYSQL_ROW row;
-   unsigned long NumRow,NumRows;
+   unsigned long NumRows;
+   unsigned long NumRow;
    long CrsCod;
    char PathDeg[PATH_MAX + 1];
 
diff --git a/swad_degree_type.c b/swad_degree_type.c
index eb115426..6baef513 100644
--- a/swad_degree_type.c
+++ b/swad_degree_type.c
@@ -883,7 +883,8 @@ static void DT_RemoveDegreeTypeCompletely (long DegTypCod)
   {
    MYSQL_RES *mysql_res;
    MYSQL_ROW row;
-   unsigned long NumRow,NumRows;
+   unsigned long NumRows;
+   unsigned long NumRow;
    long DegCod;
 
    /***** Get degrees of a type from database *****/
diff --git a/swad_enrolment.c b/swad_enrolment.c
index ae1c6afd..f5c20ea3 100644
--- a/swad_enrolment.c
+++ b/swad_enrolment.c
@@ -381,6 +381,7 @@ void Enr_WriteFormToReqAnotherUsrID (Act_Action_t NextAction,void (*FuncParams)
                     The_ClassFormInBox[Gbl.Prefs.Theme]);
    fprintf (Gbl.F.Out,"%s: ",Txt_nick_email_or_ID);
    HTM_LABEL_End ();
+
    HTM_INPUT_TEXT ("OtherUsrIDNickOrEMail",Cns_MAX_CHARS_EMAIL_ADDRESS,"",false,
 		   "size=\"18\" required=\"required\"");
 
diff --git a/swad_file_browser.c b/swad_file_browser.c
index 3a9f4af7..820e91b4 100644
--- a/swad_file_browser.c
+++ b/swad_file_browser.c
@@ -11661,7 +11661,8 @@ void Brw_RemoveUsrWorksInAllCrss (struct UsrData *UsrDat)
   {
    MYSQL_RES *mysql_res;
    MYSQL_ROW row;
-   unsigned long NumRow,NumRows;
+   unsigned long NumRows;
+   unsigned long NumRow;
    unsigned NumCrssWorksRemoved = 0;
    struct Course Crs;
 
diff --git a/swad_group.c b/swad_group.c
index ee9bbf25..30105a03 100644
--- a/swad_group.c
+++ b/swad_group.c
@@ -2129,7 +2129,7 @@ static void Grp_ListGrpsToAddOrRemUsrs (struct GroupType *GrpTyp,long UsrCod)
 		"GrpCod%ld",
 		GrpTyp->GrpTypCod);
       HTM_INPUT_CHECKBOX (StrGrpCod,false,
-			  "id=\"Grp%ld\" value=\"%ld\"%s%s",
+			  "id=\"Grp%ld\" value=\"%ld\"%s",
 			  Grp->GrpCod,Grp->GrpCod,
 			  UsrBelongsToThisGroup ? " checked=\"checked\"" : "");	// I can not register
 
diff --git a/swad_notification.c b/swad_notification.c
index 24f23d86..19a90c35 100644
--- a/swad_notification.c
+++ b/swad_notification.c
@@ -1501,7 +1501,8 @@ void Ntf_SendPendingNotifByEMailToAllUsrs (void)
   {
    MYSQL_RES *mysql_res;
    MYSQL_ROW row;
-   unsigned long NumRow,NumRows;
+   unsigned long NumRows;
+   unsigned long NumRow;
    struct UsrData UsrDat;
    unsigned NumNotif;
    unsigned NumTotalNotif = 0;
diff --git a/swad_record.c b/swad_record.c
index efe18358..4e2f1a1d 100644
--- a/swad_record.c
+++ b/swad_record.c
@@ -511,7 +511,8 @@ bool Rec_CheckIfRecordFieldIsRepeated (const char *FieldName)
    bool FieldIsRepeated = false;
    MYSQL_RES *mysql_res;
    MYSQL_ROW row;
-   unsigned long NumRow,NumRows;
+   unsigned long NumRows;
+   unsigned long NumRow;
 
    /* Query database */
    if ((NumRows = Rec_GetAllFieldsInCurrCrs (&mysql_res)) > 0)	// If se han encontrado groups...
diff --git a/swad_test.c b/swad_test.c
index 16998380..59462462 100644
--- a/swad_test.c
+++ b/swad_test.c
@@ -1771,7 +1771,8 @@ static void Tst_ShowFormEditTags (void)
    extern const char *Txt_Tags;
    MYSQL_RES *mysql_res;
    MYSQL_ROW row;
-   unsigned long NumRow,NumRows;
+   unsigned long NumRows;
+   unsigned long NumRow;
    long TagCod;
 
    /***** Get current tags in current course *****/
@@ -4794,7 +4795,8 @@ unsigned long Tst_GetTagsQst (long QstCod,MYSQL_RES **mysql_res)
 void Tst_GetAndWriteTagsQst (long QstCod)
   {
    extern const char *Txt_no_tags;
-   unsigned long NumRow,NumRows;
+   unsigned long NumRow;
+   unsigned long NumRows;
    MYSQL_RES *mysql_res;
    MYSQL_ROW row;