diff --git a/src/install.sh b/src/install.sh
index f579833..5aed2fd 100644
--- a/src/install.sh
+++ b/src/install.sh
@@ -447,22 +447,45 @@ extractESD() {
   size=9606127360
   checkFreeSpace "$dir" "$size" || return 1
 
+  local esdInfo
+  esdInfo=$(wimlib-imagex info "$iso") || {
+    error "Cannot read ESD file information!"
+    return 1
+  }
+
   local esdImageCount
-  esdImageCount=$(wimlib-imagex info "$iso" | awk '/Image Count:/ {print $3}')
+  esdImageCount=$(awk '/Image Count:/ {print $3}' <<< "$esdInfo")
 
   if [ -z "$esdImageCount" ]; then
     error "Cannot read the image count in ESD file!" && return 1
   fi
 
-  sizes=$(wimlib-imagex info "$iso" | grep "Total Bytes:")
-  links=$(wimlib-imagex info "$iso" | grep "Hard Link Bytes:")
+  if (( esdImageCount < 3 )); then
+    error "Invalid ESD file: expected at least 3 images, found $esdImageCount."
+    return 1
+  fi
+
+  sizes=$(grep "Total Bytes:" <<< "$esdInfo" || true)
+  links=$(grep "Hard Link Bytes:" <<< "$esdInfo" || true)
 
   total1=$(awk "NR==1{ print; }" <<< "$sizes" | cut -d':' -f2 | sed 's/^ *//')
   links1=$(awk "NR==1{ print; }" <<< "$links" | cut -d':' -f2 | sed 's/^ *//')
+
+  if [[ ! "$total1" =~ ^[0-9]+$ ]] || [[ ! "$links1" =~ ^[0-9]+$ ]]; then
+    error "Cannot read bootdisk size from ESD file!"
+    return 1
+  fi
+
   total=$(( total1 - links1 ))
 
   total3=$(awk "NR==3{ print; }" <<< "$sizes" | cut -d':' -f2 | sed 's/^ *//')
   links3=$(awk "NR==3{ print; }" <<< "$links" | cut -d':' -f2 | sed 's/^ *//')
+
+  if [[ ! "$total3" =~ ^[0-9]+$ ]] || [[ ! "$links3" =~ ^[0-9]+$ ]]; then
+    error "Cannot read bootdisk size from ESD file!"
+    return 1
+  fi
+  
   total3=$(( total3 - links3 ))
   total3=$(( total3 + 60000000 ))
 
diff --git a/src/mido.sh b/src/mido.sh
index 59c8400..9a2180a 100644
--- a/src/mido.sh
+++ b/src/mido.sh
@@ -589,22 +589,22 @@ getESD() {
 
   echo "$result" > "$dir/$eFile"
 
-  local tag="FilePath"
-  ESD=$(xmllint --nonet --xpath "//$tag" "$dir/$eFile" | sed -E -e "s/<[\/]?$tag>//g" 2>/dev/null)
+  tag="FilePath"
+  ESD=$(xmllint --nonet --xpath "//$tag" "$dir/$eFile" 2>/dev/null | sed -E -e "s/<[\/]?$tag>//g" || true)
 
   if [ -z "$ESD" ]; then
     error "Failed to find ESD URL in $eFile!" && return 1
   fi
 
   tag="Sha1"
-  ESD_SUM=$(xmllint --nonet --xpath "//$tag" "$dir/$eFile" | sed -E -e "s/<[\/]?$tag>//g" 2>/dev/null)
+  ESD_SUM=$(xmllint --nonet --xpath "//$tag" "$dir/$eFile" 2>/dev/null | sed -E -e "s/<[\/]?$tag>//g" || true)
 
   if [ -z "$ESD_SUM" ]; then
     error "Failed to find ESD checksum in $eFile!" && return 1
   fi
 
   tag="Size"
-  ESD_SIZE=$(xmllint --nonet --xpath "//$tag" "$dir/$eFile" | sed -E -e "s/<[\/]?$tag>//g" 2>/dev/null)
+  ESD_SIZE=$(xmllint --nonet --xpath "//$tag" "$dir/$eFile" 2>/dev/null | sed -E -e "s/<[\/]?$tag>//g" || true)
 
   if [ -z "$ESD_SIZE" ]; then
     error "Failed to find ESD filesize in $eFile!" && return 1