From ef8f5c67bd71dd7c87eee0d64a0803dbb4bc20fa Mon Sep 17 00:00:00 2001
From: WerWolv <werwolv98@gmail.com>
Date: Thu, 14 Aug 2025 23:57:58 +0200
Subject: [PATCH] build: Fix error during install in offline builds

---
 cmake/build_helpers.cmake | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/cmake/build_helpers.cmake b/cmake/build_helpers.cmake
index 57e16ab6c..a165846e8 100644
--- a/cmake/build_helpers.cmake
+++ b/cmake/build_helpers.cmake
@@ -641,10 +641,12 @@ function(downloadImHexPatternsFiles dest)
             endforeach()
         ]])
     else()
-        set(PATTERNS_FOLDERS_TO_INSTALL constants encodings includes patterns magic nodes)
-        foreach (FOLDER ${PATTERNS_FOLDERS_TO_INSTALL})
-            install(DIRECTORY "${imhex_patterns_SOURCE_DIR}/${FOLDER}" DESTINATION "${dest}" PATTERN "**/_schema.json" EXCLUDE)
-        endforeach ()
+        if (NOT (imhex_patterns_SOURCE_DIR STREQUAL ""))
+            set(PATTERNS_FOLDERS_TO_INSTALL constants encodings includes patterns magic nodes)
+            foreach (FOLDER ${PATTERNS_FOLDERS_TO_INSTALL})
+                install(DIRECTORY "${imhex_patterns_SOURCE_DIR}/${FOLDER}" DESTINATION "${dest}" PATTERN "**/_schema.json" EXCLUDE)
+            endforeach ()
+        endif()
     endif ()
 
 endfunction()