diff --git a/Makefile b/Makefile
index a16f2f8..137802f 100644
--- a/Makefile
+++ b/Makefile
@@ -42,7 +42,7 @@ NTHREADS= $(shell nproc)
 CC=gcc
 WARNINGS= -Wall
 DEBUG= -ggdb -fno-omit-frame-pointer -fdiagnostics-color=always
-OPTIMIZE= -O2
+OPTIMIZE= -O3
 INCLUDE= $(shell pkg-config --cflags glib-2.0 libxml-2.0 gtk4)
 LIBS= $(shell pkg-config --libs glib-2.0 libxml-2.0 gtk4) -lGL -lGLU -lm -lepoxy -lX11 -lGLEW
 
@@ -121,6 +121,12 @@ run: build_system
 	@$(BINDIR)/gem-graph-client
 	@echo -e ${CL2}[$@] ${CL}done.${CL3}
 
+debug: build_system
+	@echo -e ${CL2}[$@] ${CL}executing...${CL3}
+	@gdb $(BINDIR)/gem-graph-client
+	@echo -e ${CL2}[$@] ${CL}done.${CL3}
+
 all:	build_system
 	@echo -e ${CL2}[$@] ${CL}done.${CL3}
 
+
diff --git a/include/base.h b/include/base.h
index a05146e..c390fba 100644
--- a/include/base.h
+++ b/include/base.h
@@ -49,17 +49,19 @@ enum
  */
 static inline bool read_file(char *filename, char **contents)
 {
-    int fd = open(filename, O_RDONLY);
+    int fd;
+    int filesize;
 
+    fd = open(filename, O_RDONLY);
     if(fd < 0) {
         printf("Couldn't read file: %s\n",filename);
         return false;
     }
 
-    int filesize = lseek(fd, 0, SEEK_END) +1 ;
-    *contents = malloc(sizeof(char) * filesize);
+    filesize = lseek(fd, 0, SEEK_END) +1 ;
+    *contents = calloc(filesize, sizeof(char));
 
-    if (errno) {
+    if (contents == NULL) {
         perror("Not enough memory to allocate file");
         return false;
     }
@@ -67,7 +69,7 @@ static inline bool read_file(char *filename, char **contents)
     lseek(fd, 0, SEEK_SET);
     read(fd,*contents,filesize);
 
-    *contents[filesize-1]='\0';
+    *(contents+filesize-1)='\0';
 
     close(fd);
 
diff --git a/manifest.scm b/manifest.scm
index d77a78b..39b777c 100644
--- a/manifest.scm
+++ b/manifest.scm
@@ -10,6 +10,7 @@
       "gcc-toolchain"
       "pkg-config"
       "findutils"
+      "gdb"
       "make"
       "gtk"
       "libxml2"
diff --git a/src/graphics/graphics.c b/src/graphics/graphics.c
index b35e4e6..ff0c9f1 100644
--- a/src/graphics/graphics.c
+++ b/src/graphics/graphics.c
@@ -46,7 +46,7 @@
 /*
  * Dynamic array of ptr to dynamically allocated gl_area_entry
  */
-static struct gl_area_entry **gl_area_array = NULL;
+struct gl_area_entry **gl_area_array = NULL;
 
 /* -------------------------------------------------------------------------- */
 
@@ -495,7 +495,8 @@ bool graphics_init(void *gl_area)
         gl_area_array = calloc(2, sizeof(struct gl_area_entry *));
 
         // check if an error occured during allocation
-        if (errno) {
+        if (gl_area_array == NULL) {
+            printf("gl_area_array : %p", gl_area_array);
             perror("Not enough memory to allocate gl_area_array");
             return false;
         }
@@ -505,16 +506,19 @@ bool graphics_init(void *gl_area)
         gl_area_array = realloc(gl_area_array,
                                 (array_size + 1)
                                  * sizeof(struct gl_area_entry *));
-        if (errno) {
+        if (gl_area_array == NULL) {
             perror("Not enough memory to allocate gl_area_array");
             return false;
         }
+
+        explicit_bzero(gl_area_array + array_size * sizeof(struct gl_area_entry *),
+                       sizeof(struct gl_area_entry *));
     }
 
     // Alloc new entry
     gl_area_array[array_size] = calloc(1, sizeof(struct gl_area_entry));
 
-    if (errno) {
+    if (gl_area_array[array_size] == NULL) {
         perror("Not enough memory to allocate gl_area_array entry");
         return false;
     }