diff --git a/conf/vsc_kul_uhasselt.config b/conf/vsc_kul_uhasselt.config
index 92e9780d..69e938e8 100644
--- a/conf/vsc_kul_uhasselt.config
+++ b/conf/vsc_kul_uhasselt.config
@@ -69,7 +69,7 @@ profiles {
                 singularity.runOptions = '--containall --cleanenv --nv'
                 clusterOptions         = {
                     // suggested to use 9 cpus per gpu
-                    def gpus = task.accelerator?.request ?: Math.max(1, Math.floor(task.cpus/9) as int)
+                    def gpus = task.accelerator?.request ?: Math.max(1, Math.floor((task.cpus ?:1)/9) as int)
                     "--gres=gpu:${gpus} --clusters=genius --account=$tier1_project"
                 }
 
@@ -92,7 +92,7 @@ profiles {
             // 768 - 65 so 65GB for overhead, max is 720000MB
             resourceLimits = [ memory: 703.GB, cpus: 36, time: 168.h]
             clusterOptions = {
-                def gpus = task.accelerator?.request ?: Math.max(1, Math.floor(task.cpus/9) as int)
+                def gpus = task.accelerator?.request ?: Math.max(1, Math.floor((task.cpus ?:1)/9) as int)
                 "--gres=gpu:${gpus} --clusters=genius --account=$tier1_project"
             }
 
@@ -124,7 +124,7 @@ profiles {
                 singularity.runOptions = '--containall --cleanenv --nv'
                 clusterOptions         = {
                     // suggested to use 16 cpus per gpu
-                    def gpus = task.accelerator?.request ?: Math.max(1, Math.floor(task.cpus/16) as int)
+                    def gpus = task.accelerator?.request ?: Math.max(1, Math.floor((task.cpus ?:1)/16) as int)
                     "--gres=gpu:${gpus} --clusters=wice --account=$tier1_project"
                 }
 
@@ -147,7 +147,7 @@ profiles {
             // 768 - 65 so 65GB for overhead, max is 720000MB
             resourceLimits = [ memory: 703.GB, cpus: 64, time: 168.h ]
             clusterOptions = {
-                def gpus = task.accelerator?.request ?: Math.max(1, Math.floor(task.cpus/16) as int)
+                def gpus = task.accelerator?.request ?: Math.max(1, Math.floor((task.cpus ?:1)/16) as int)
                 "--gres=gpu:${gpus} --clusters=wice --account=$tier1_project"
             }