--- calamares-3.2.32.1/src/modules/partition/core/PartitionLayout.cpp.orig	2020-11-07 18:42:24.546000000 +0100
+++ calamares-3.2.32.1/src/modules/partition/core/PartitionLayout.cpp	2020-11-07 18:54:28.790000000 +0100
@@ -283,6 +283,12 @@
             size = availableSize;
         }
 
+        if ( availableSize < 5 * 1024 * 1024) {
+            cWarning() << "Partition" << part.partMountPoint << "available size"
+                << "is insufficient to add partition, skipping...";
+            continue;
+        }
+
         end = firstSector + std::max( size - 1, Q_INT64_C( 0 ) );
 
         if ( luksPassphrase.isEmpty() )