diff --git a/src/screencast_keys/gpu_utils/imm.py b/src/screencast_keys/gpu_utils/imm.py
index 9f95378..e7848f5 100644
--- a/src/screencast_keys/gpu_utils/imm.py
+++ b/src/screencast_keys/gpu_utils/imm.py
@@ -211,7 +211,8 @@ def immEnd():
     scissor_box = inst.get_scissor()
     # TODO: Other than OpenGL backend, scissor is not supported.
     #       Temporary turn off when gpu.state.scissor_set is implemented.
-    if hasattr(gpu.platform, "backend_type_get") and \
+    if hasattr(gpu, "hasattr") and \
+            hasattr(gpu.platform, "backend_type_get") and \
             gpu.platform.backend_type_get() != 'OPENGL':
         scissor_box = None
 
diff --git a/src/screencast_keys/gpu_utils/shader.py b/src/screencast_keys/gpu_utils/shader.py
index a4692d3..6781336 100644
--- a/src/screencast_keys/gpu_utils/shader.py
+++ b/src/screencast_keys/gpu_utils/shader.py
@@ -47,7 +47,8 @@ class ShaderManager:
 
     @classmethod
     def register_shaders(cls):
-        if hasattr(gpu.platform, "backend_type_get") and \
+        if hasattr(gpu, "platform") and \
+                hasattr(gpu.platform, "backend_type_get") and \
                 gpu.platform.backend_type_get() != 'OPENGL':
             return
 
@@ -75,7 +76,8 @@ def register_shaders(cls):
 
     @classmethod
     def unregister_shaders(cls):
-        if hasattr(gpu.platform, "backend_type_get") and \
+        if hasattr(gpu, "platform") and \
+                hasattr(gpu.platform, "backend_type_get") and \
                 gpu.platform.backend_type_get() != 'OPENGL':
             return
 
@@ -85,7 +87,8 @@ def unregister_shaders(cls):
 
     @classmethod
     def get_shader(cls, shader_name):
-        if hasattr(gpu.platform, "backend_type_get") and \
+        if hasattr(gpu, "platform") and \
+                hasattr(gpu.platform, "backend_type_get") and \
                 gpu.platform.backend_type_get() != 'OPENGL':
             return None
 
diff --git a/src/screencast_keys/utils/compatibility.py b/src/screencast_keys/utils/compatibility.py
index 9701da1..48a8704 100644
--- a/src/screencast_keys/utils/compatibility.py
+++ b/src/screencast_keys/utils/compatibility.py
@@ -70,7 +70,7 @@ def add_if_exist(cls_name, space_name, space_types):
 
 
 def blf_size(font_id, font_size, dpi):
-    if check_version(3, 4, 0) >= 0:
+    try:
         blf.size(font_id, font_size)
-    else:
+    except TypeError:
         blf.size(font_id, font_size, dpi)