diff --git a/src/banded/BandedMatrix.jl b/src/banded/BandedMatrix.jl
index 6678c4a6..8544d734 100644
--- a/src/banded/BandedMatrix.jl
+++ b/src/banded/BandedMatrix.jl
@@ -713,6 +713,7 @@ const BandedSubBandedMatrix{T, C, R, I1<:AbstractUnitRange, I2<:AbstractUnitRang
 isbanded(::BandedSubBandedMatrix) = true
 sublayout(::BandedColumns{L}, ::Type{<:Tuple{AbstractUnitRange,J}}) where {L,J<:AbstractUnitRange} = 
     bandedcolumns(sublayout(L(),Tuple{Slice{OneTo{Int}},J}))
+getindex_value(A::SubArray) = getindex_value(parent(A))    
 BroadcastStyle(::Type{<:BandedSubBandedMatrix}) = BandedStyle()
 
 function _shift(bm::BandedSubBandedMatrix)
diff --git a/src/banded/gbmm.jl b/src/banded/gbmm.jl
index 4a5c0475..3d161836 100644
--- a/src/banded/gbmm.jl
+++ b/src/banded/gbmm.jl
@@ -218,6 +218,8 @@ function gbmm!(tA::Char, tB::Char, α::T, A::AbstractMatrix{T}, B::AbstractMatri
     @assert ν == size(B,1)
     @assert m == size(C,2)
 
+    (n == 0 || ν == 0 || m == 0) && return C
+
     Al, Au = bandwidths(A)
     Bl, Bu = bandwidths(B)
     C̃l, C̃u = bandwidths(C)
diff --git a/src/generic/indexing.jl b/src/generic/indexing.jl
index 7cdede8b..1ce39ab5 100644
--- a/src/generic/indexing.jl
+++ b/src/generic/indexing.jl
@@ -24,7 +24,7 @@ inbands_setindex!(x::Transpose, v, i::Integer, j::Integer) =
 # on the memory layout
 ###
 
-sub_materialize(::AbstractBandedLayout, V) = BandedMatrix(V)
+sub_materialize(::AbstractBandedLayout, V, _) = BandedMatrix(V)
 
 @inline getindex(A::AbstractBandedMatrix, kr::Colon, jr::Colon) = lazy_getindex(A, kr, jr)
 @inline getindex(A::AbstractBandedMatrix, kr::Colon, jr::AbstractUnitRange) = lazy_getindex(A, kr, jr)