diff --git a/ereuse_devicehub/resources/device/models.py b/ereuse_devicehub/resources/device/models.py
index a0ba0f20..05af6f9b 100644
--- a/ereuse_devicehub/resources/device/models.py
+++ b/ereuse_devicehub/resources/device/models.py
@@ -1262,16 +1262,18 @@ class Computer(Device):
     @property
     def ram_size(self) -> int:
         """The total of RAM memory the computer has."""
-        return sum(
-            ram.size or 0 for ram in self.components if isinstance(ram, RamModule)
-        )
+        components = self.components
+        if self.placeholder and self.placeholder.binding:
+            components = self.placeholder.binding.components
+        return sum(ram.size or 0 for ram in components if isinstance(ram, RamModule))
 
     @property
     def data_storage_size(self) -> int:
         """The total of data storage the computer has."""
-        return sum(
-            ds.size or 0 for ds in self.components if isinstance(ds, DataStorage)
-        )
+        components = self.components
+        if self.placeholder and self.placeholder.binding:
+            components = self.placeholder.binding.components
+        return sum(ds.size or 0 for ds in components if isinstance(ds, DataStorage))
 
     @property
     def processor_model(self) -> str:
diff --git a/ereuse_devicehub/templates/inventory/erasure.html b/ereuse_devicehub/templates/inventory/erasure.html
index 130ca3c1..681f31a6 100644
--- a/ereuse_devicehub/templates/inventory/erasure.html
+++ b/ereuse_devicehub/templates/inventory/erasure.html
@@ -288,10 +288,10 @@
           {% for erasure in erasures %}
           <tr style="border-bottom: 1px dashed #000;">
             <td>
-              {{ erasure.device.serial_number.upper() }}
+              {{ erasure.device.serial_number and erasure.device.serial_number.upper() or '' }}
             </td>
             <td>
-              {{ erasure.parent.serial_number.upper() }}
+              {{ erasure.parent.serial_number and erasure.parent.serial_number.upper() or '' }}
             </td>
             <td>
               {{ erasure.get_public_name() }}