diff --git a/scripts/refreshQueryCache.sh b/scripts/refreshQueryCache.sh
index b4a6304..8489aa2 100755
--- a/scripts/refreshQueryCache.sh
+++ b/scripts/refreshQueryCache.sh
@@ -1,15 +1,16 @@
-#!/bin/bash
+#!/bin/sh
 
 # jsinfo/scripts/refreshQueryCache.sh
 
 REST_URL="${REST_URL:-http://0.0.0.0:8080}"
 
 get() {
-    local url="$1"
-    local retries=5
-    local response=""
+    url="$1"
+    retries=5
+    response=""
     echo "revalidate_cache: calling get on $REST_URL$url" >&2
-    for ((i=0; i<$retries; i++)); do
+    i=0
+    while [ $i -lt $retries ]; do
         response=$(curl -s "$REST_URL$url")
         echo "$response"
         if echo "$response" | jq . > /dev/null 2>&1; then
@@ -17,14 +18,15 @@ get() {
             echo "$response" >&2
             return
         fi
+        i=$((i+1))
         sleep 0.5
     done
 }
 
 revalidate_cache_for_specs() {
     echo "revalidate_cache: Revalidating cache for specs..."
-    local response=$(get "/specs")
-    local specs=$(echo "$response" | jq -r '.specs[] | .id')
+    response=$(get "/specs")
+    specs=$(echo "$response" | jq -r '.specs[] | .id')
     for spec in $specs; do
         echo "revalidate_cache: calling $REST_URL/spec/$spec"
         curl -s "$REST_URL/spec/$spec" > /dev/null
@@ -33,8 +35,8 @@ revalidate_cache_for_specs() {
 
 revalidate_cache_for_consumers() {
     echo "revalidate_cache: Revalidating cache for consumers..."
-    local response=$(get "/consumers")
-    local consumers=$(echo "$response" | jq -r '.consumers[] | .address')
+    response=$(get "/consumers")
+    consumers=$(echo "$response" | jq -r '.consumers[] | .address')
     for consumer in $consumers; do
         echo "revalidate_cache: calling $REST_URL/consumer/$consumer"
         curl -s "$REST_URL/consumer/$consumer" > /dev/null
@@ -43,11 +45,13 @@ revalidate_cache_for_consumers() {
 
 revalidate_cache_for_providers() {
     echo "revalidate_cache: Revalidating cache for providers..."
-    local response=$(get "/providers")
-    local providers=$(echo "$response" | jq -r '.providers[] | .address')
+    response=$(get "/providers")
+    providers=$(echo "$response" | jq -r '.providers[] | .address')
     for provider in $providers; do
-        echo "revalidate_cache: calling $REST_URL/provider/$provider"
-        curl -s "$REST_URL/provider/$provider" > /dev/null
+        if [ "$provider" != "null" ]; then
+            echo "revalidate_cache: calling $REST_URL/provider/$provider"
+            curl -s "$REST_URL/provider/$provider" > /dev/null
+        fi
     done
 }